Initial commit

2019-06-24 05:49:24 +09:00
commit 3e216e1aa4
98 changed files with 12591 additions and 0 deletions
@@ -0,0 +1,42 @@
+---
+name: Bug Report
+about: Create a bug report.
+---
+
+## Checklist
+- [ ] This is not a Apple's bug.  
+- [ ] Reviewed the README and documents.  
+- [ ] Searched existing issues for ensure not duplicated.  
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Detailed Description (Include Screenshots)
+<!--- Provide a detailed description of the bug -->
+
+## Reproducible Demo Project
+<!--- If you have, provide links of bug reproducible project that we can refer -->
+
+## Environments
+- version:
+
+- Swift version:
+
+- iOS version:
+
+- Xcode version:
+
+- Devices/Simulators:
+
+- CocoaPods/Carthage version:
@@ -0,0 +1,18 @@
+---
+name: Feature Request
+about: Create a feature request.
+---
+
+## Checklist
+- [ ] Reviewed the README and documents.  
+- [ ] Searched existing issues for ensure not duplicated.  
+
+## Description
+<!--- Provide a detailed description of the feature you are proposing -->
+
+## Motivation and Context
+<!--- Why is this feature required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Proposed Solution
+<!--- Describe the solution you proposing. -->
@@ -0,0 +1,30 @@
+---
+name: Question
+about: Create a bug question.
+---
+
+## Checklist
+- [ ] Reviewed the README and documents.  
+- [ ] Searched existing issues for ensure not duplicated.  
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Detailed Description (Include Screenshots)
+<!--- Provide a detailed description of your question -->
+
+## Environment
+- version:
+
+- Swift version:
+
+- iOS version:
+
+- Xcode version:
+
+- Devices/Simulators:
+
+- CocoaPods/Carthage version:
@@ -0,0 +1,23 @@
+## Checklist
+- [ ] All tests are passed.  
+- [ ] Added tests.  
+- [ ] Documented the code using [Xcode markup](https://developer.apple.com/library/mac/documentation/Xcode/Reference/xcode_markup_formatting_ref).  
+- [ ] Searched existing pull requests for ensure not duplicated.  
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Related Issue
+<!--- This project only accepts pull requests related to open issues -->
+<!--- If suggesting a new feature or change, please discuss it in an issue first -->
+<!--- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!--- Please link to the issue here: -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Impact on Existing Code
+<!--- Tell us the impact on existing code as far as you understand. -->
+
+## Screenshots (if appropriate)
@@ -0,0 +1,38 @@
+.DS_Store
+*/build/*
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+xcbaselines
+profile
+*.moved-aside
+DerivedData
+.idea/
+*.hmap
+*.xccheckout
+*.xcuserstate
+build/
+
+## Documentation
+docs/docsets/
+docs/undocumented.json
+
+## Gems
+.bundle
+vendor
+
+## CocoaPods
+Pods
+
+## Carthage
+Carthage/*
+!Carthage/Checkouts
+
+## Swift Package Manager
+.build
@@ -0,0 +1,3 @@
+[submodule "Carthage/Checkouts/DifferenceKit"]
+	path = Carthage/Checkouts/DifferenceKit
+	url = https://github.com/ra1028/DifferenceKit.git
@@ -0,0 +1,30 @@
+# https://github.com/realm/jazzy
+
+author: Ryo Aoyama
+author_url: https://github.com/ra1028
+github_url: https://github.com/ra1028/DiffableDataSources
+module: DiffableDataSources
+readme: README.md
+output: docs
+theme: fullwidth
+clean: true
+skip_undocumented: true
+xcodebuild_arguments:
+  - -workspace
+  - DiffableDataSources.xcworkspace
+  - -scheme
+  - DiffableDataSources
+  - -sdk
+  - iphonesimulator
+
+exclude:
+  - Sources/AppKit/CocoaCollectionViewDiffableDataSource.swift
+
+custom_categories:
+  - name: DataSources
+    children:
+    - TableViewDiffableDataSource
+    - CollectionViewDiffableDataSource
+  - name: Snapshot
+    children:
+    - DiffableDataSourceSnapshot
@@ -0,0 +1 @@
+5.0
@@ -0,0 +1,34 @@
+# https://github.com/realm/SwiftLint
+
+excluded:
+  - .build
+  - Carthage
+  - Examples
+
+disabled_rules:
+  - type_name
+  - identifier_name
+  - generic_type_name
+  - force_cast
+
+nesting:
+  type_level:
+    warning: 2
+
+line_length:
+  warning: 200
+
+file_length:
+  warning: 600
+
+type_body_length:
+  warning: 400
+
+function_body_length:
+  warning: 50
+
+cyclomatic_complexity:
+  warning: 12
+
+statement_position:
+  statement_mode: uncuddled_else
@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [INSERT EMAIL ADDRESS]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq
@@ -0,0 +1,91 @@
+# 🎈 Contributing
+
+First of all, thanks for your interest.  
+
+There are several ways to contribute to this project. We welcome contributions in all ways.  
+We have made some contribution guidelines to smoothly incorporate your opinions and code into this project.  
+
+## 📝 Open Issue
+
+When you found a bug or having a feature request, search for the issue from the existing issues and feel free to open the issue after making sure it isn't already reported.  
+
+In order to we understand your issue accurately, please include as much information as possible in the issue template.  
+The screenshot are also big clue to understand the issue.  
+
+If you know exactly how to fix the bug you report or implement the feature you propose, please pull request instead of an issue.  
+
+## 🚀 Pull Request
+
+We are waiting for a pull request to make this project more better with us.  
+If you want to add a new feature, let's discuss about it first on issue.  
+
+### Lint
+
+Please introduce [SwiftLint](https://github.com/realm/SwiftLint) into your environment before start writing the code.  
+Xcode automatically runs lint in the build phase.  
+
+The code written according to lint should match our coding style, but for particular cases where style is unknown, refer to the existing code base.  
+
+### Test
+
+The test will tells us the validity of your code.  
+All codes entering the master must pass the all tests.  
+If you change the code or add new features, you should add tests.  
+
+### Documentation
+
+Please write the document using [Xcode markup](https://developer.apple.com/library/archive/documentation/Xcode/Reference/xcode_markup_formatting_ref/) to the code you added.  
+Documentation template is inserted automatically by using Xcode shortcut **⌥⌘/**.  
+Our document style is slightly different from the template. The example is below.  
+
+```swift
+/// The example class for documentation.
+final class Foo {
+    /// A property value.
+    let prop: Int
+
+    /// Create a new foo with a param.
+    ///
+    /// - Parameters:
+    ///   -  param: An Int value for prop.
+    init(param: Int) {
+        prop = param
+    }
+
+    /// Returns a string value concatenating `param1` and `param2`.
+    ///
+    /// - Parameters:
+    ///   - param1: An Int value for prefix.
+    ///   - param2: A String value for suffix.
+    ///
+    /// - Returns: A string concatenating given params.
+    func bar(param1: Int, param2: String) -> String {
+        return "\(param1)" + param2
+    }
+}
+```
+
+## [Developer's Certificate of Origin 1.1](https://elinux.org/Developer_Certificate_Of_Origin)
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
@@ -0,0 +1 @@
+github "ra1028/DifferenceKit" ~> 1.1
@@ -0,0 +1 @@
+github "ra1028/DifferenceKit" "1.1.3"
@@ -0,0 +1,27 @@
+Pod::Spec.new do |spec|
+  spec.name = 'DiffableDataSources'
+  spec.version  = '0.1.0'
+  spec.author = { 'ra1028' => 'r.fe51028.r@gmail.com' }
+  spec.homepage = 'https://github.com/ra1028/DiffableDataSources'
+  spec.documentation_url = 'https://ra1028.github.io/DiffableDataSources'
+  spec.summary = 'A library for backporting UITableView/UICollectionViewDiffableDataSource.'
+  spec.source = { :git => 'https://github.com/ra1028/DiffableDataSources.git', :tag => spec.version.to_s }
+  spec.license = { :type => 'Apache 2.0', :file => 'LICENSE' }
+  spec.requires_arc = true
+  spec.source_files = 'Sources/**/*.swift'
+  spec.swift_versions = ["5.0", "5.1"]
+
+  differenekit_version = '~> 1.1'
+
+  spec.ios.dependency 'DifferenceKit/UIKitExtension', differenekit_version
+  spec.tvos.dependency 'DifferenceKit/UIKitExtension', differenekit_version
+  spec.osx.dependency 'DifferenceKit/AppKitExtension', differenekit_version
+
+  spec.ios.frameworks = 'UIKit'
+  spec.tvos.frameworks = 'UIKit'
+  spec.osx.frameworks = 'Appkit'
+
+  spec.ios.deployment_target = '9.0'
+  spec.tvos.deployment_target = '9.0'
+  spec.osx.deployment_target = '10.11'
+end
@@ -0,0 +1,591 @@
+// !$*UTF8*$!
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+	objectVersion = 50;
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+				6B02216422BA11D500AEB14D /* Extension.swift in Sources */,
+				6B02216222BA0EF500AEB14D /* InsertionSortViewController.swift in Sources */,
+				6BB7630722B545240050DC03 /* AppDelegate.swift in Sources */,
+				6B46555622B6AB0C005202D1 /* MountainsRawData.swift in Sources */,
+				6B02216822BB7FA800AEB14D /* TopViewController.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		6BA3A7A122B69EE200AD51ED /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				6BA3A7A222B69EE200AD51ED /* Base */,
+			);
+			name = Main.storyboard;
+			sourceTree = "<group>";
+		};
+		6BB7630F22B545260050DC03 /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				6BB7631022B545260050DC03 /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		6BA3A7A622B69EE200AD51ED /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_ENTITLEMENTS = "Example-macOS/Example_macOS.entitlements";
+				CODE_SIGN_IDENTITY = "-";
+				CODE_SIGN_STYLE = Manual;
+				COMBINE_HIDPI_IMAGES = YES;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = "Example-macOS/Info.plist";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.ryo.DiffableDataSourcesExample-macOS";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SDKROOT = macosx;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		6BA3A7A722B69EE200AD51ED /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_ENTITLEMENTS = "Example-macOS/Example_macOS.entitlements";
+				CODE_SIGN_IDENTITY = "-";
+				CODE_SIGN_STYLE = Manual;
+				COMBINE_HIDPI_IMAGES = YES;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = "Example-macOS/Info.plist";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.ryo.DiffableDataSourcesExample-macOS";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SDKROOT = macosx;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
+		6BB7631322B545260050DC03 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		6BB7631422B545260050DC03 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		6BB7631622B545260050DC03 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Manual;
+				DEVELOPMENT_TEAM = "";
+				GCC_OPTIMIZATION_LEVEL = s;
+				INFOPLIST_FILE = "Example-iOS/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.ryo.DiffableDataSourcesExample-iOS";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TVOS_DEPLOYMENT_TARGET = "";
+			};
+			name = Debug;
+		};
+		6BB7631722B545260050DC03 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Manual;
+				DEVELOPMENT_TEAM = "";
+				INFOPLIST_FILE = "Example-iOS/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.ryo.DiffableDataSourcesExample-iOS";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TVOS_DEPLOYMENT_TARGET = "";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		6BA3A7A822B69EE200AD51ED /* Build configuration list for PBXNativeTarget "Example-macOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6BA3A7A622B69EE200AD51ED /* Debug */,
+				6BA3A7A722B69EE200AD51ED /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		6BB762FE22B545240050DC03 /* Build configuration list for PBXProject "DiffableDataSourcesExamples" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6BB7631322B545260050DC03 /* Debug */,
+				6BB7631422B545260050DC03 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		6BB7631522B545260050DC03 /* Build configuration list for PBXNativeTarget "Example-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6BB7631622B545260050DC03 /* Debug */,
+				6BB7631722B545260050DC03 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 6BB762FB22B545240050DC03 /* Project object */;
+}
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:DiffableDataSourcesExample-iOS.xcodeproj">
+   </FileRef>
+</Workspace>
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1020"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6BB7630222B545240050DC03"
+               BuildableName = "Example-iOS.app"
+               BlueprintName = "Example-iOS"
+               ReferencedContainer = "container:DiffableDataSourcesExamples.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6BB7630222B545240050DC03"
+            BuildableName = "Example-iOS.app"
+            BlueprintName = "Example-iOS"
+            ReferencedContainer = "container:DiffableDataSourcesExamples.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6BB7630222B545240050DC03"
+            BuildableName = "Example-iOS.app"
+            BlueprintName = "Example-iOS"
+            ReferencedContainer = "container:DiffableDataSourcesExamples.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6BB7630222B545240050DC03"
+            BuildableName = "Example-iOS.app"
+            BlueprintName = "Example-iOS"
+            ReferencedContainer = "container:DiffableDataSourcesExamples.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:DiffableDataSourcesExamples.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:../DiffableDataSources.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:../Carthage/Checkouts/DifferenceKit/DifferenceKit.xcodeproj">
+   </FileRef>
+</Workspace>
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
@@ -0,0 +1,17 @@
+import UIKit
+
+@UIApplicationMain
+final class AppDelegate: UIResponder, UIApplicationDelegate {
+    var window: UIWindow?
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
+        let window = UIWindow()
+        let navigationController = UINavigationController(rootViewController: TopViewController())
+        navigationController.navigationBar.tintColor = .black
+        window.rootViewController = navigationController
+        window.makeKeyAndVisible()
+        self.window = window
+
+        return true
+    }
+}
@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
@@ -0,0 +1,13 @@
+import UIKit
+
+extension UITableViewCell {
+    static var name: String {
+        return String(describing: self)
+    }
+}
+
+extension UICollectionViewCell {
+    static var name: String {
+        return String(describing: self)
+    }
+}
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string></string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
@@ -0,0 +1,172 @@
+import UIKit
+import DiffableDataSources
+
+final class InsertionSortViewController: UIViewController {
+    final class Section: Hashable {
+        var id = UUID()
+        var nodes: [Node]
+        private(set) var isSorted = false
+        private var currentIndex = 1
+
+        init(count: Int) {
+            nodes = (0..<count).map { Node(value: $0, maxValue: count) }.shuffled()
+        }
+
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(id)
+        }
+
+        func sortNext() {
+            guard !isSorted, nodes.count > 1 else {
+                return isSorted = true
+            }
+
+            var index = currentIndex
+            let currentNode = nodes[index]
+            index -= 1
+
+            while index >= 0 && currentNode.value < nodes[index].value {
+                let node = nodes[index]
+                nodes[index] = currentNode
+                nodes[index + 1] = node
+                index -= 1
+            }
+
+            currentIndex += 1
+
+            if currentIndex >= nodes.count {
+                isSorted = true
+            }
+        }
+
+        static func == (lhs: Section, rhs: Section) -> Bool {
+            return lhs.id == rhs.id
+        }
+    }
+
+    struct Node: Hashable {
+        var id = UUID()
+        var value: Int
+        var color: UIColor
+
+        init(value: Int, maxValue: Int) {
+            let hue = CGFloat(value) / CGFloat(maxValue)
+            self.value = value
+            color = UIColor(hue: hue, saturation: 1, brightness: 1, alpha: 1)
+            id = UUID()
+        }
+
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(id)
+        }
+
+        static func == (lhs: Node, rhs: Node) -> Bool {
+            return lhs.id == rhs.id
+        }
+    }
+
+    @IBOutlet private var collectionView: UICollectionView!
+    private var isSorting = false
+
+    let nodeSize = CGSize(width: 16, height: 34)
+
+    private lazy var dataSource = CollectionViewDiffableDataSource<Section, Node>(collectionView: collectionView) { collectionView, indexPath, node in
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UICollectionViewCell.name, for: indexPath)
+        cell.backgroundColor = node.color
+        return cell
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Insertion Sort"
+
+        collectionView.delegate = self
+        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: UICollectionViewCell.name)
+        navigationItem.rightBarButtonItem = UIBarButtonItem(title: nil, style: .plain, target: self, action: #selector(toggleSort))
+
+        updateSortButtonTitle()
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        randmize(animated: false)
+    }
+
+    @objc func toggleSort() {
+        isSorting.toggle()
+        updateSortButtonTitle()
+
+        if isSorting {
+            startInsertionSort()
+        }
+    }
+
+    func updateSortButtonTitle() {
+        navigationItem.rightBarButtonItem?.title = isSorting ? "Stop" : "Sort"
+    }
+
+    func randmize(animated: Bool) {
+        let snapshot = DiffableDataSourceSnapshot<Section, Node>()
+        let rows = Int(collectionView.bounds.height / nodeSize.height) - 1
+        let columns = Int(collectionView.bounds.width / nodeSize.width)
+
+        for _ in 0..<rows {
+            let section = Section(count: columns)
+            snapshot.appendSections([section])
+            snapshot.appendItems(section.nodes)
+        }
+
+        dataSource.apply(snapshot, animatingDifferences: animated)
+    }
+
+    func startInsertionSort() {
+        guard isSorting else {
+            return
+        }
+
+        var isNextSortRequired = false
+        let snapshot = dataSource.snapshot()
+
+        for section in snapshot.sectionIdentifiers where !section.isSorted {
+            section.sortNext()
+            let items = section.nodes
+            snapshot.deleteItems(items)
+            snapshot.appendItems(items, toSection: section)
+            isNextSortRequired = true
+        }
+
+        if isNextSortRequired {
+            dataSource.apply(snapshot)
+        }
+
+        DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(isNextSortRequired ? 150 : 1000)) { [weak self] in
+            guard let self = self else {
+                return
+            }
+
+            if !isNextSortRequired {
+                self.randmize(animated: false)
+            }
+            self.startInsertionSort()
+        }
+    }
+}
+
+extension InsertionSortViewController: UICollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        return 0
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
+        return 0
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
+        return .zero
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        return nodeSize
+    }
+}
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="InsertionSortViewController" customModule="Example_iOS" customModuleProvider="target">
+            <connections>
+                <outlet property="collectionView" destination="6GZ-26-LaT" id="93h-pF-UdX"/>
+                <outlet property="view" destination="iN0-l3-epB" id="SEV-ah-gIe"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="iN0-l3-epB">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" bounces="NO" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" bouncesZoom="NO" dataMode="none" translatesAutoresizingMaskIntoConstraints="NO" id="6GZ-26-LaT">
+                    <rect key="frame" x="0.0" y="44" width="414" height="852"/>
+                    <color key="backgroundColor" white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="IOA-0B-TAt">
+                        <size key="itemSize" width="50" height="50"/>
+                        <size key="headerReferenceSize" width="0.0" height="0.0"/>
+                        <size key="footerReferenceSize" width="0.0" height="0.0"/>
+                        <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
+                    </collectionViewFlowLayout>
+                </collectionView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+            <constraints>
+                <constraint firstItem="6GZ-26-LaT" firstAttribute="top" secondItem="vUN-kp-3ea" secondAttribute="top" id="N1l-xD-bVR"/>
+                <constraint firstAttribute="trailing" secondItem="6GZ-26-LaT" secondAttribute="trailing" id="WAV-gN-b0a"/>
+                <constraint firstAttribute="bottom" secondItem="6GZ-26-LaT" secondAttribute="bottom" id="cwF-t5-pdY"/>
+                <constraint firstItem="6GZ-26-LaT" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" id="lef-dU-E4k"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="vUN-kp-3ea"/>
+        </view>
+    </objects>
+</document>
@@ -0,0 +1,12 @@
+import UIKit
+
+final class LabelCell: UICollectionViewCell {
+    @IBOutlet var label: UILabel!
+
+    override func awakeFromNib() {
+        super.awakeFromNib()
+
+        layer.borderWidth = 1
+        layer.borderColor = UIColor.gray.cgColor
+    }
+}
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="pYo-4D-KR8" customClass="LabelCell" customModule="Example_iOS" customModuleProvider="target">
+            <rect key="frame" x="0.0" y="0.0" width="300" height="32"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO">
+                <rect key="frame" x="0.0" y="0.0" width="300" height="32"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="qKi-9G-J20">
+                        <rect key="frame" x="10" y="0.0" width="280" height="32"/>
+                        <fontDescription key="fontDescription" style="UICTFontTextStyleBody"/>
+                        <nil key="textColor"/>
+                        <nil key="highlightedColor"/>
+                    </label>
+                </subviews>
+            </view>
+            <constraints>
+                <constraint firstItem="qKi-9G-J20" firstAttribute="leading" secondItem="pYo-4D-KR8" secondAttribute="leading" constant="10" id="UJN-ZW-lz4"/>
+                <constraint firstAttribute="trailing" secondItem="qKi-9G-J20" secondAttribute="trailing" constant="10" id="VbK-qH-sMr"/>
+                <constraint firstItem="qKi-9G-J20" firstAttribute="top" secondItem="pYo-4D-KR8" secondAttribute="top" id="YkZ-vn-KK6"/>
+                <constraint firstAttribute="bottom" secondItem="qKi-9G-J20" secondAttribute="bottom" id="au1-M8-Hh2"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="wQ5-Q0-9Pt"/>
+            <connections>
+                <outlet property="label" destination="qKi-9G-J20" id="hp7-fh-rao"/>
+            </connections>
+            <point key="canvasLocation" x="-1" y="74"/>
+        </collectionViewCell>
+    </objects>
+</document>
@@ -0,0 +1,84 @@
+import UIKit
+import DiffableDataSources
+
+final class MountainsViewController: UIViewController {
+    enum Section {
+        case main
+    }
+
+    struct Mountain: Hashable {
+        var name: String
+
+        func contains(_ filter: String) -> Bool {
+            guard !filter.isEmpty else {
+                return true
+            }
+
+            let lowercasedFilter = filter.lowercased()
+            return name.lowercased().contains(lowercasedFilter)
+        }
+    }
+
+    @IBOutlet private var searchBar: UISearchBar!
+    @IBOutlet private var collectionView: UICollectionView!
+
+    private lazy var dataSource = CollectionViewDiffableDataSource<Section, Mountain>(collectionView: collectionView) { collectionView, indexPath, mountain in
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: LabelCell.name, for: indexPath) as! LabelCell
+        cell.label.text = mountain.name
+        return cell
+    }
+
+    private let allMountains: [Mountain] = mountainsRawData.components(separatedBy: .newlines).map { line in
+        let name = line.components(separatedBy: ",")[0]
+        return Mountain(name: name)
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Mountains Search"
+
+        searchBar.delegate = self
+        collectionView.delegate = self
+        collectionView.register(UINib(nibName: LabelCell.name, bundle: .main), forCellWithReuseIdentifier: LabelCell.name)
+
+        search(filter: "")
+    }
+
+    func search(filter: String) {
+        let mountains = allMountains.lazy
+            .filter { $0.contains(filter) }
+            .sorted { $0.name < $1.name }
+
+        let snapshot = DiffableDataSourceSnapshot<Section, Mountain>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(mountains)
+        dataSource.apply(snapshot)
+    }
+}
+
+extension MountainsViewController: UISearchBarDelegate {
+    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
+        search(filter: searchText)
+    }
+}
+
+extension MountainsViewController: UICollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
+        return UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        let column = 2
+        let width = (collectionView.bounds.width - 10 * CGFloat(column + 1)) / CGFloat(column)
+        return CGSize(width: width, height: 32)
+    }
+}
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="MountainsViewController" customModule="DiffableDataSourcesExample_iOS" customModuleProvider="target">
+            <connections>
+                <outlet property="collectionView" destination="kRf-0w-rJc" id="OBe-Sd-A2L"/>
+                <outlet property="searchBar" destination="t4I-uz-ABD" id="NtR-qE-qZn"/>
+                <outlet property="view" destination="a1D-Hd-aJU" id="Oyu-9w-QKH"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="a1D-Hd-aJU">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <subviews>
+                <searchBar contentMode="redraw" translatesAutoresizingMaskIntoConstraints="NO" id="t4I-uz-ABD">
+                    <rect key="frame" x="0.0" y="44" width="414" height="56"/>
+                    <textInputTraits key="textInputTraits"/>
+                </searchBar>
+                <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" keyboardDismissMode="onDrag" dataMode="none" translatesAutoresizingMaskIntoConstraints="NO" id="kRf-0w-rJc">
+                    <rect key="frame" x="0.0" y="120" width="414" height="776"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="0.0" minimumInteritemSpacing="0.0" id="vHO-Ju-ApP">
+                        <size key="itemSize" width="50" height="50"/>
+                        <size key="headerReferenceSize" width="0.0" height="0.0"/>
+                        <size key="footerReferenceSize" width="0.0" height="0.0"/>
+                        <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
+                    </collectionViewFlowLayout>
+                </collectionView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+            <constraints>
+                <constraint firstAttribute="bottom" secondItem="kRf-0w-rJc" secondAttribute="bottom" id="CBM-WJ-k93"/>
+                <constraint firstItem="t4I-uz-ABD" firstAttribute="leading" secondItem="a1D-Hd-aJU" secondAttribute="leading" id="H5j-5C-2jy"/>
+                <constraint firstAttribute="trailing" secondItem="kRf-0w-rJc" secondAttribute="trailing" id="Hog-jr-nJY"/>
+                <constraint firstItem="t4I-uz-ABD" firstAttribute="top" secondItem="ujY-YI-BSN" secondAttribute="top" id="IkY-zg-lm8"/>
+                <constraint firstItem="kRf-0w-rJc" firstAttribute="top" secondItem="t4I-uz-ABD" secondAttribute="bottom" constant="20" id="aJ9-Wc-4Jd"/>
+                <constraint firstAttribute="trailing" secondItem="t4I-uz-ABD" secondAttribute="trailing" id="d5P-My-ReY"/>
+                <constraint firstItem="kRf-0w-rJc" firstAttribute="leading" secondItem="a1D-Hd-aJU" secondAttribute="leading" id="esv-zM-Pc2"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="ujY-YI-BSN"/>
+            <point key="canvasLocation" x="17" y="173"/>
+        </view>
+    </objects>
+</document>
@@ -0,0 +1,82 @@
+import UIKit
+import DiffableDataSources
+
+final class TopViewController: UIViewController {
+    enum Section {
+        case main
+    }
+
+    enum Item {
+        case mountains
+        case insertionSort
+    }
+
+    @IBOutlet private var tableView: UITableView!
+
+    private lazy var dataSource = TableViewDiffableDataSource<Section, Item>(tableView: tableView) { tableView, indexPath, item in
+        let cell = tableView.dequeueReusableCell(withIdentifier: UITableViewCell.name, for: indexPath)
+        cell.textLabel?.text = item.title
+        cell.accessoryType = .disclosureIndicator
+        return cell
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "DiffableDataSources"
+
+        tableView.delegate = self
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: UITableViewCell.name)
+        tableView.rowHeight = 60
+        tableView.contentInset.top = 30
+
+        reset()
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+
+        if let indexPath = tableView.indexPathForSelectedRow {
+            tableView.deselectRow(at: indexPath, animated: true)
+        }
+    }
+
+    func reset() {
+        let snapshot = DiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems([.mountains, .insertionSort])
+        dataSource.apply(snapshot)
+    }
+}
+
+extension TopViewController: UITableViewDelegate {
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        guard let item = dataSource.itemIdentifier(for: indexPath) else {
+            return
+        }
+
+        let viewController: UIViewController
+
+        switch item {
+        case .mountains:
+            viewController = MountainsViewController()
+
+        case .insertionSort:
+            viewController = InsertionSortViewController()
+        }
+
+        navigationController?.pushViewController(viewController, animated: true)
+    }
+}
+
+private extension TopViewController.Item {
+    var title: String {
+        switch self {
+        case .mountains:
+            return "🗻 Mountains"
+
+        case .insertionSort:
+            return "📱 Insertion Sort"
+        }
+    }
+}
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="TopViewController" customModule="Example_iOS" customModuleProvider="target">
+            <connections>
+                <outlet property="tableView" destination="tX9-V1-EJv" id="EHH-CF-6fE"/>
+                <outlet property="view" destination="Ude-8O-7bT" id="VCy-jI-QZK"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="Ude-8O-7bT">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <subviews>
+                <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="tX9-V1-EJv">
+                    <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                </tableView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+            <constraints>
+                <constraint firstAttribute="bottom" secondItem="tX9-V1-EJv" secondAttribute="bottom" id="0fN-0u-kPN"/>
+                <constraint firstItem="tX9-V1-EJv" firstAttribute="top" secondItem="Ude-8O-7bT" secondAttribute="top" id="NML-7Q-dfc"/>
+                <constraint firstItem="tX9-V1-EJv" firstAttribute="leading" secondItem="Ude-8O-7bT" secondAttribute="leading" id="h66-Ya-k2Y"/>
+                <constraint firstAttribute="trailing" secondItem="tX9-V1-EJv" secondAttribute="trailing" id="phG-hF-KAp"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="iZn-f5-WVt"/>
+            <point key="canvasLocation" x="68" y="141"/>
+        </view>
+    </objects>
+</document>
@@ -0,0 +1,4 @@
+import Cocoa
+
+@NSApplicationMain
+final class AppDelegate: NSObject, NSApplicationDelegate {}
@@ -0,0 +1,58 @@
+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
@@ -0,0 +1,773 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="14810.11" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14810.11"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Application-->
+        <scene sceneID="JPo-4y-FX3">
+            <objects>
+                <application id="hnw-xV-0zn" sceneMemberID="viewController">
+                    <menu key="mainMenu" title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
+                        <items>
+                            <menuItem title="Example-macOS" id="1Xt-HY-uBw">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Example-macOS" systemMenu="apple" id="uQy-DD-JDr">
+                                    <items>
+                                        <menuItem title="About Example-macOS" id="5kV-Vb-QxS">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="orderFrontStandardAboutPanel:" target="Ady-hI-5gd" id="Exp-CZ-Vem"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="VOq-y0-SEH"/>
+                                        <menuItem title="Preferences…" keyEquivalent="," id="BOF-NM-1cW"/>
+                                        <menuItem isSeparatorItem="YES" id="wFC-TO-SCJ"/>
+                                        <menuItem title="Services" id="NMo-om-nkz">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Services" systemMenu="services" id="hz9-B4-Xy5"/>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="4je-JR-u6R"/>
+                                        <menuItem title="Hide Example-macOS" keyEquivalent="h" id="Olw-nP-bQN">
+                                            <connections>
+                                                <action selector="hide:" target="Ady-hI-5gd" id="PnN-Uc-m68"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Hide Others" keyEquivalent="h" id="Vdr-fp-XzO">
+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="hideOtherApplications:" target="Ady-hI-5gd" id="VT4-aY-XCT"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Show All" id="Kd2-mp-pUS">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="unhideAllApplications:" target="Ady-hI-5gd" id="Dhg-Le-xox"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="kCx-OE-vgT"/>
+                                        <menuItem title="Quit Example-macOS" keyEquivalent="q" id="4sb-4s-VLi">
+                                            <connections>
+                                                <action selector="terminate:" target="Ady-hI-5gd" id="Te7-pn-YzF"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="File" id="dMs-cI-mzQ">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="File" id="bib-Uj-vzu">
+                                    <items>
+                                        <menuItem title="New" keyEquivalent="n" id="Was-JA-tGl">
+                                            <connections>
+                                                <action selector="newDocument:" target="Ady-hI-5gd" id="4Si-XN-c54"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Open…" keyEquivalent="o" id="IAo-SY-fd9">
+                                            <connections>
+                                                <action selector="openDocument:" target="Ady-hI-5gd" id="bVn-NM-KNZ"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Open Recent" id="tXI-mr-wws">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Open Recent" systemMenu="recentDocuments" id="oas-Oc-fiZ">
+                                                <items>
+                                                    <menuItem title="Clear Menu" id="vNY-rz-j42">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="clearRecentDocuments:" target="Ady-hI-5gd" id="Daa-9d-B3U"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="m54-Is-iLE"/>
+                                        <menuItem title="Close" keyEquivalent="w" id="DVo-aG-piG">
+                                            <connections>
+                                                <action selector="performClose:" target="Ady-hI-5gd" id="HmO-Ls-i7Q"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Save…" keyEquivalent="s" id="pxx-59-PXV">
+                                            <connections>
+                                                <action selector="saveDocument:" target="Ady-hI-5gd" id="teZ-XB-qJY"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Save As…" keyEquivalent="S" id="Bw7-FT-i3A">
+                                            <connections>
+                                                <action selector="saveDocumentAs:" target="Ady-hI-5gd" id="mDf-zr-I0C"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Revert to Saved" keyEquivalent="r" id="KaW-ft-85H">
+                                            <connections>
+                                                <action selector="revertDocumentToSaved:" target="Ady-hI-5gd" id="iJ3-Pv-kwq"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="aJh-i4-bef"/>
+                                        <menuItem title="Page Setup…" keyEquivalent="P" id="qIS-W8-SiK">
+                                            <modifierMask key="keyEquivalentModifierMask" shift="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="runPageLayout:" target="Ady-hI-5gd" id="Din-rz-gC5"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Print…" keyEquivalent="p" id="aTl-1u-JFS">
+                                            <connections>
+                                                <action selector="print:" target="Ady-hI-5gd" id="qaZ-4w-aoO"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Edit" id="5QF-Oa-p0T">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Edit" id="W48-6f-4Dl">
+                                    <items>
+                                        <menuItem title="Undo" keyEquivalent="z" id="dRJ-4n-Yzg">
+                                            <connections>
+                                                <action selector="undo:" target="Ady-hI-5gd" id="M6e-cu-g7V"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Redo" keyEquivalent="Z" id="6dh-zS-Vam">
+                                            <connections>
+                                                <action selector="redo:" target="Ady-hI-5gd" id="oIA-Rs-6OD"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="WRV-NI-Exz"/>
+                                        <menuItem title="Cut" keyEquivalent="x" id="uRl-iY-unG">
+                                            <connections>
+                                                <action selector="cut:" target="Ady-hI-5gd" id="YJe-68-I9s"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Copy" keyEquivalent="c" id="x3v-GG-iWU">
+                                            <connections>
+                                                <action selector="copy:" target="Ady-hI-5gd" id="G1f-GL-Joy"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Paste" keyEquivalent="v" id="gVA-U4-sdL">
+                                            <connections>
+                                                <action selector="paste:" target="Ady-hI-5gd" id="UvS-8e-Qdg"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Paste and Match Style" keyEquivalent="V" id="WeT-3V-zwk">
+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="pasteAsPlainText:" target="Ady-hI-5gd" id="cEh-KX-wJQ"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Delete" id="pa3-QI-u2k">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="delete:" target="Ady-hI-5gd" id="0Mk-Ml-PaM"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Select All" keyEquivalent="a" id="Ruw-6m-B2m">
+                                            <connections>
+                                                <action selector="selectAll:" target="Ady-hI-5gd" id="VNm-Mi-diN"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="uyl-h8-XO2"/>
+                                        <menuItem title="Find" id="4EN-yA-p0u">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Find" id="1b7-l0-nxx">
+                                                <items>
+                                                    <menuItem title="Find…" tag="1" keyEquivalent="f" id="Xz5-n4-O0W">
+                                                        <connections>
+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="cD7-Qs-BN4"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Find and Replace…" tag="12" keyEquivalent="f" id="YEy-JH-Tfz">
+                                                        <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                                        <connections>
+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="WD3-Gg-5AJ"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Find Next" tag="2" keyEquivalent="g" id="q09-fT-Sye">
+                                                        <connections>
+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="NDo-RZ-v9R"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Find Previous" tag="3" keyEquivalent="G" id="OwM-mh-QMV">
+                                                        <connections>
+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="HOh-sY-3ay"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Use Selection for Find" tag="7" keyEquivalent="e" id="buJ-ug-pKt">
+                                                        <connections>
+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="U76-nv-p5D"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Jump to Selection" keyEquivalent="j" id="S0p-oC-mLd">
+                                                        <connections>
+                                                            <action selector="centerSelectionInVisibleArea:" target="Ady-hI-5gd" id="IOG-6D-g5B"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                        <menuItem title="Spelling and Grammar" id="Dv1-io-Yv7">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Spelling" id="3IN-sU-3Bg">
+                                                <items>
+                                                    <menuItem title="Show Spelling and Grammar" keyEquivalent=":" id="HFo-cy-zxI">
+                                                        <connections>
+                                                            <action selector="showGuessPanel:" target="Ady-hI-5gd" id="vFj-Ks-hy3"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Check Document Now" keyEquivalent=";" id="hz2-CU-CR7">
+                                                        <connections>
+                                                            <action selector="checkSpelling:" target="Ady-hI-5gd" id="fz7-VC-reM"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="bNw-od-mp5"/>
+                                                    <menuItem title="Check Spelling While Typing" id="rbD-Rh-wIN">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleContinuousSpellChecking:" target="Ady-hI-5gd" id="7w6-Qz-0kB"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Check Grammar With Spelling" id="mK6-2p-4JG">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleGrammarChecking:" target="Ady-hI-5gd" id="muD-Qn-j4w"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Correct Spelling Automatically" id="78Y-hA-62v">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleAutomaticSpellingCorrection:" target="Ady-hI-5gd" id="2lM-Qi-WAP"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                        <menuItem title="Substitutions" id="9ic-FL-obx">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Substitutions" id="FeM-D8-WVr">
+                                                <items>
+                                                    <menuItem title="Show Substitutions" id="z6F-FW-3nz">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="orderFrontSubstitutionsPanel:" target="Ady-hI-5gd" id="oku-mr-iSq"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="gPx-C9-uUO"/>
+                                                    <menuItem title="Smart Copy/Paste" id="9yt-4B-nSM">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleSmartInsertDelete:" target="Ady-hI-5gd" id="3IJ-Se-DZD"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Smart Quotes" id="hQb-2v-fYv">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleAutomaticQuoteSubstitution:" target="Ady-hI-5gd" id="ptq-xd-QOA"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Smart Dashes" id="rgM-f4-ycn">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleAutomaticDashSubstitution:" target="Ady-hI-5gd" id="oCt-pO-9gS"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Smart Links" id="cwL-P1-jid">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleAutomaticLinkDetection:" target="Ady-hI-5gd" id="Gip-E3-Fov"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Data Detectors" id="tRr-pd-1PS">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleAutomaticDataDetection:" target="Ady-hI-5gd" id="R1I-Nq-Kbl"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Text Replacement" id="HFQ-gK-NFA">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleAutomaticTextReplacement:" target="Ady-hI-5gd" id="DvP-Fe-Py6"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                        <menuItem title="Transformations" id="2oI-Rn-ZJC">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Transformations" id="c8a-y6-VQd">
+                                                <items>
+                                                    <menuItem title="Make Upper Case" id="vmV-6d-7jI">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="uppercaseWord:" target="Ady-hI-5gd" id="sPh-Tk-edu"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Make Lower Case" id="d9M-CD-aMd">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="lowercaseWord:" target="Ady-hI-5gd" id="iUZ-b5-hil"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Capitalize" id="UEZ-Bs-lqG">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="capitalizeWord:" target="Ady-hI-5gd" id="26H-TL-nsh"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                        <menuItem title="Speech" id="xrE-MZ-jX0">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Speech" id="3rS-ZA-NoH">
+                                                <items>
+                                                    <menuItem title="Start Speaking" id="Ynk-f8-cLZ">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="startSpeaking:" target="Ady-hI-5gd" id="654-Ng-kyl"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Stop Speaking" id="Oyz-dy-DGm">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="stopSpeaking:" target="Ady-hI-5gd" id="dX8-6p-jy9"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Format" id="jxT-CU-nIS">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Format" id="GEO-Iw-cKr">
+                                    <items>
+                                        <menuItem title="Font" id="Gi5-1S-RQB">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Font" systemMenu="font" id="aXa-aM-Jaq">
+                                                <items>
+                                                    <menuItem title="Show Fonts" keyEquivalent="t" id="Q5e-8K-NDq">
+                                                        <connections>
+                                                            <action selector="orderFrontFontPanel:" target="YLy-65-1bz" id="WHr-nq-2xA"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Bold" tag="2" keyEquivalent="b" id="GB9-OM-e27">
+                                                        <connections>
+                                                            <action selector="addFontTrait:" target="YLy-65-1bz" id="hqk-hr-sYV"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Italic" tag="1" keyEquivalent="i" id="Vjx-xi-njq">
+                                                        <connections>
+                                                            <action selector="addFontTrait:" target="YLy-65-1bz" id="IHV-OB-c03"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Underline" keyEquivalent="u" id="WRG-CD-K1S">
+                                                        <connections>
+                                                            <action selector="underline:" target="Ady-hI-5gd" id="FYS-2b-JAY"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="5gT-KC-WSO"/>
+                                                    <menuItem title="Bigger" tag="3" keyEquivalent="+" id="Ptp-SP-VEL">
+                                                        <connections>
+                                                            <action selector="modifyFont:" target="YLy-65-1bz" id="Uc7-di-UnL"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Smaller" tag="4" keyEquivalent="-" id="i1d-Er-qST">
+                                                        <connections>
+                                                            <action selector="modifyFont:" target="YLy-65-1bz" id="HcX-Lf-eNd"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="kx3-Dk-x3B"/>
+                                                    <menuItem title="Kern" id="jBQ-r6-VK2">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <menu key="submenu" title="Kern" id="tlD-Oa-oAM">
+                                                            <items>
+                                                                <menuItem title="Use Default" id="GUa-eO-cwY">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="useStandardKerning:" target="Ady-hI-5gd" id="6dk-9l-Ckg"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Use None" id="cDB-IK-hbR">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="turnOffKerning:" target="Ady-hI-5gd" id="U8a-gz-Maa"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Tighten" id="46P-cB-AYj">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="tightenKerning:" target="Ady-hI-5gd" id="hr7-Nz-8ro"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Loosen" id="ogc-rX-tC1">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="loosenKerning:" target="Ady-hI-5gd" id="8i4-f9-FKE"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                            </items>
+                                                        </menu>
+                                                    </menuItem>
+                                                    <menuItem title="Ligatures" id="o6e-r0-MWq">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <menu key="submenu" title="Ligatures" id="w0m-vy-SC9">
+                                                            <items>
+                                                                <menuItem title="Use Default" id="agt-UL-0e3">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="useStandardLigatures:" target="Ady-hI-5gd" id="7uR-wd-Dx6"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Use None" id="J7y-lM-qPV">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="turnOffLigatures:" target="Ady-hI-5gd" id="iX2-gA-Ilz"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Use All" id="xQD-1f-W4t">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="useAllLigatures:" target="Ady-hI-5gd" id="KcB-kA-TuK"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                            </items>
+                                                        </menu>
+                                                    </menuItem>
+                                                    <menuItem title="Baseline" id="OaQ-X3-Vso">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <menu key="submenu" title="Baseline" id="ijk-EB-dga">
+                                                            <items>
+                                                                <menuItem title="Use Default" id="3Om-Ey-2VK">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="unscript:" target="Ady-hI-5gd" id="0vZ-95-Ywn"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Superscript" id="Rqc-34-cIF">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="superscript:" target="Ady-hI-5gd" id="3qV-fo-wpU"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Subscript" id="I0S-gh-46l">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="subscript:" target="Ady-hI-5gd" id="Q6W-4W-IGz"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Raise" id="2h7-ER-AoG">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="raiseBaseline:" target="Ady-hI-5gd" id="4sk-31-7Q9"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem title="Lower" id="1tx-W0-xDw">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="lowerBaseline:" target="Ady-hI-5gd" id="OF1-bc-KW4"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                            </items>
+                                                        </menu>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="Ndw-q3-faq"/>
+                                                    <menuItem title="Show Colors" keyEquivalent="C" id="bgn-CT-cEk">
+                                                        <connections>
+                                                            <action selector="orderFrontColorPanel:" target="Ady-hI-5gd" id="mSX-Xz-DV3"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="iMs-zA-UFJ"/>
+                                                    <menuItem title="Copy Style" keyEquivalent="c" id="5Vv-lz-BsD">
+                                                        <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                                        <connections>
+                                                            <action selector="copyFont:" target="Ady-hI-5gd" id="GJO-xA-L4q"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Paste Style" keyEquivalent="v" id="vKC-jM-MkH">
+                                                        <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                                        <connections>
+                                                            <action selector="pasteFont:" target="Ady-hI-5gd" id="JfD-CL-leO"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                        <menuItem title="Text" id="Fal-I4-PZk">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Text" id="d9c-me-L2H">
+                                                <items>
+                                                    <menuItem title="Align Left" keyEquivalent="{" id="ZM1-6Q-yy1">
+                                                        <connections>
+                                                            <action selector="alignLeft:" target="Ady-hI-5gd" id="zUv-R1-uAa"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Center" keyEquivalent="|" id="VIY-Ag-zcb">
+                                                        <connections>
+                                                            <action selector="alignCenter:" target="Ady-hI-5gd" id="spX-mk-kcS"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Justify" id="J5U-5w-g23">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="alignJustified:" target="Ady-hI-5gd" id="ljL-7U-jND"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Align Right" keyEquivalent="}" id="wb2-vD-lq4">
+                                                        <connections>
+                                                            <action selector="alignRight:" target="Ady-hI-5gd" id="r48-bG-YeY"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="4s2-GY-VfK"/>
+                                                    <menuItem title="Writing Direction" id="H1b-Si-o9J">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <menu key="submenu" title="Writing Direction" id="8mr-sm-Yjd">
+                                                            <items>
+                                                                <menuItem title="Paragraph" enabled="NO" id="ZvO-Gk-QUH">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                </menuItem>
+                                                                <menuItem id="YGs-j5-SAR">
+                                                                    <string key="title">	Default</string>
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="makeBaseWritingDirectionNatural:" target="Ady-hI-5gd" id="qtV-5e-UBP"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem id="Lbh-J2-qVU">
+                                                                    <string key="title">	Left to Right</string>
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="makeBaseWritingDirectionLeftToRight:" target="Ady-hI-5gd" id="S0X-9S-QSf"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem id="jFq-tB-4Kx">
+                                                                    <string key="title">	Right to Left</string>
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="makeBaseWritingDirectionRightToLeft:" target="Ady-hI-5gd" id="5fk-qB-AqJ"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem isSeparatorItem="YES" id="swp-gr-a21"/>
+                                                                <menuItem title="Selection" enabled="NO" id="cqv-fj-IhA">
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                </menuItem>
+                                                                <menuItem id="Nop-cj-93Q">
+                                                                    <string key="title">	Default</string>
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="makeTextWritingDirectionNatural:" target="Ady-hI-5gd" id="lPI-Se-ZHp"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem id="BgM-ve-c93">
+                                                                    <string key="title">	Left to Right</string>
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="makeTextWritingDirectionLeftToRight:" target="Ady-hI-5gd" id="caW-Bv-w94"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                                <menuItem id="RB4-Sm-HuC">
+                                                                    <string key="title">	Right to Left</string>
+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
+                                                                    <connections>
+                                                                        <action selector="makeTextWritingDirectionRightToLeft:" target="Ady-hI-5gd" id="EXD-6r-ZUu"/>
+                                                                    </connections>
+                                                                </menuItem>
+                                                            </items>
+                                                        </menu>
+                                                    </menuItem>
+                                                    <menuItem isSeparatorItem="YES" id="fKy-g9-1gm"/>
+                                                    <menuItem title="Show Ruler" id="vLm-3I-IUL">
+                                                        <modifierMask key="keyEquivalentModifierMask"/>
+                                                        <connections>
+                                                            <action selector="toggleRuler:" target="Ady-hI-5gd" id="FOx-HJ-KwY"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Copy Ruler" keyEquivalent="c" id="MkV-Pr-PK5">
+                                                        <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
+                                                        <connections>
+                                                            <action selector="copyRuler:" target="Ady-hI-5gd" id="71i-fW-3W2"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                    <menuItem title="Paste Ruler" keyEquivalent="v" id="LVM-kO-fVI">
+                                                        <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
+                                                        <connections>
+                                                            <action selector="pasteRuler:" target="Ady-hI-5gd" id="cSh-wd-qM2"/>
+                                                        </connections>
+                                                    </menuItem>
+                                                </items>
+                                            </menu>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="View" id="H8h-7b-M4v">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="View" id="HyV-fh-RgO">
+                                    <items>
+                                        <menuItem title="Show Toolbar" keyEquivalent="t" id="snW-S8-Cw5">
+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="toggleToolbarShown:" target="Ady-hI-5gd" id="BXY-wc-z0C"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Customize Toolbar…" id="1UK-8n-QPP">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="runToolbarCustomizationPalette:" target="Ady-hI-5gd" id="pQI-g3-MTW"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="hB3-LF-h0Y"/>
+                                        <menuItem title="Show Sidebar" keyEquivalent="s" id="kIP-vf-haE">
+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="toggleSidebar:" target="Ady-hI-5gd" id="iwa-gc-5KM"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Enter Full Screen" keyEquivalent="f" id="4J7-dP-txa">
+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="toggleFullScreen:" target="Ady-hI-5gd" id="dU3-MA-1Rq"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Window" id="aUF-d1-5bR">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Window" systemMenu="window" id="Td7-aD-5lo">
+                                    <items>
+                                        <menuItem title="Minimize" keyEquivalent="m" id="OY7-WF-poV">
+                                            <connections>
+                                                <action selector="performMiniaturize:" target="Ady-hI-5gd" id="VwT-WD-YPe"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Zoom" id="R4o-n2-Eq4">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="performZoom:" target="Ady-hI-5gd" id="DIl-cC-cCs"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="eu3-7i-yIM"/>
+                                        <menuItem title="Bring All to Front" id="LE2-aR-0XJ">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="arrangeInFront:" target="Ady-hI-5gd" id="DRN-fu-gQh"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Help" id="wpr-3q-Mcd">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Help" systemMenu="help" id="F2S-fz-NVQ">
+                                    <items>
+                                        <menuItem title="Example-macOS Help" keyEquivalent="?" id="FKE-Sm-Kum">
+                                            <connections>
+                                                <action selector="showHelp:" target="Ady-hI-5gd" id="y7X-2Q-9no"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                        </items>
+                    </menu>
+                    <connections>
+                        <outlet property="delegate" destination="Voe-Tx-rLC" id="PrD-fu-P6m"/>
+                    </connections>
+                </application>
+                <customObject id="Voe-Tx-rLC" customClass="AppDelegate" customModule="Example_macOS" customModuleProvider="target"/>
+                <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
+                <customObject id="Ady-hI-5gd" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="75" y="0.0"/>
+        </scene>
+        <!--Window Controller-->
+        <scene sceneID="R2V-B0-nI4">
+            <objects>
+                <windowController id="B8D-0N-5wS" sceneMemberID="viewController">
+                    <window key="window" title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="IQv-IB-iLA">
+                        <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
+                        <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
+                        <rect key="contentRect" x="196" y="240" width="480" height="270"/>
+                        <rect key="screenRect" x="0.0" y="0.0" width="1680" height="1027"/>
+                        <connections>
+                            <outlet property="delegate" destination="B8D-0N-5wS" id="98r-iN-zZc"/>
+                        </connections>
+                    </window>
+                    <connections>
+                        <segue destination="XfG-lQ-9wD" kind="relationship" relationship="window.shadowedContentViewController" id="cq2-FE-JQM"/>
+                    </connections>
+                </windowController>
+                <customObject id="Oky-zY-oP4" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="75" y="250"/>
+        </scene>
+        <!--Mountains View Controller-->
+        <scene sceneID="hIz-AP-VOD">
+            <objects>
+                <viewController id="XfG-lQ-9wD" customClass="MountainsViewController" customModule="Example_macOS" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" id="m2S-Jp-Qdl">
+                        <rect key="frame" x="0.0" y="0.0" width="480" height="270"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                        <subviews>
+                            <scrollView wantsLayer="YES" autohidesScrollers="YES" horizontalLineScroll="10" horizontalPageScroll="10" verticalLineScroll="10" verticalPageScroll="10" hasHorizontalScroller="NO" usesPredominantAxisScrolling="NO" translatesAutoresizingMaskIntoConstraints="NO" id="4GE-cR-LXC">
+                                <rect key="frame" x="0.0" y="0.0" width="480" height="226"/>
+                                <clipView key="contentView" id="4a9-Kh-LYH">
+                                    <rect key="frame" x="1" y="1" width="478" height="224"/>
+                                    <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                                    <subviews>
+                                        <collectionView id="dtA-VK-I9R">
+                                            <rect key="frame" x="0.0" y="0.0" width="478" height="224"/>
+                                            <autoresizingMask key="autoresizingMask" widthSizable="YES"/>
+                                            <collectionViewFlowLayout key="collectionViewLayout" minimumInteritemSpacing="10" minimumLineSpacing="10" id="eNu-C9-mnA">
+                                                <size key="itemSize" width="50" height="50"/>
+                                            </collectionViewFlowLayout>
+                                            <color key="primaryBackgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
+                                        </collectionView>
+                                    </subviews>
+                                </clipView>
+                                <scroller key="horizontalScroller" hidden="YES" wantsLayer="YES" verticalHuggingPriority="750" horizontal="YES" id="L20-kk-UVn">
+                                    <rect key="frame" x="-100" y="-100" width="233" height="15"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                </scroller>
+                                <scroller key="verticalScroller" hidden="YES" wantsLayer="YES" verticalHuggingPriority="750" doubleValue="1" horizontal="NO" id="asA-yX-Sp8">
+                                    <rect key="frame" x="463" y="1" width="16" height="224"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                </scroller>
+                            </scrollView>
+                            <searchField wantsLayer="YES" verticalHuggingPriority="750" textCompletion="NO" translatesAutoresizingMaskIntoConstraints="NO" id="E8d-oD-QL3">
+                                <rect key="frame" x="0.0" y="226" width="480" height="44"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="44" id="bgu-eY-Zmy"/>
+                                </constraints>
+                                <searchFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" selectable="YES" editable="YES" borderStyle="bezel" usesSingleLineMode="YES" bezelStyle="round" id="YVe-iR-NNY">
+                                    <font key="font" metaFont="system"/>
+                                    <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                                    <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                                </searchFieldCell>
+                                <connections>
+                                    <action selector="searchFieldDidChangeText:" target="XfG-lQ-9wD" id="Gr9-gO-Z7U"/>
+                                </connections>
+                            </searchField>
+                        </subviews>
+                        <constraints>
+                            <constraint firstItem="4GE-cR-LXC" firstAttribute="leading" secondItem="m2S-Jp-Qdl" secondAttribute="leading" id="VIk-Ok-vIc"/>
+                            <constraint firstItem="4GE-cR-LXC" firstAttribute="top" secondItem="E8d-oD-QL3" secondAttribute="bottom" id="XQU-W6-iZ1"/>
+                            <constraint firstAttribute="bottom" secondItem="4GE-cR-LXC" secondAttribute="bottom" id="YzV-Nw-2Vr"/>
+                            <constraint firstItem="E8d-oD-QL3" firstAttribute="leading" secondItem="m2S-Jp-Qdl" secondAttribute="leading" id="ZFg-Fj-FCw"/>
+                            <constraint firstItem="E8d-oD-QL3" firstAttribute="top" secondItem="m2S-Jp-Qdl" secondAttribute="top" id="gxF-Uq-fEV"/>
+                            <constraint firstAttribute="trailing" secondItem="E8d-oD-QL3" secondAttribute="trailing" id="iJG-BW-3qO"/>
+                            <constraint firstAttribute="trailing" secondItem="4GE-cR-LXC" secondAttribute="trailing" id="icw-4L-Z2L"/>
+                        </constraints>
+                    </view>
+                    <connections>
+                        <outlet property="collectionView" destination="dtA-VK-I9R" id="gbo-bM-Eme"/>
+                        <outlet property="searchField" destination="E8d-oD-QL3" id="eKx-B7-AkC"/>
+                    </connections>
+                </viewController>
+                <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="75" y="655"/>
+        </scene>
+    </scenes>
+</document>
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.app-sandbox</key>
+    <true/>
+    <key>com.apple.security.files.user-selected.read-only</key>
+    <true/>
+</dict>
+</plist>
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2019 Ryo Aoyama. All rights reserved.</string>
+	<key>NSMainStoryboardFile</key>
+	<string>Main</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>
@@ -0,0 +1,31 @@
+import AppKit
+
+final class LabelItem: NSCollectionViewItem {
+    static var itemIdentifier: NSUserInterfaceItemIdentifier {
+        return NSUserInterfaceItemIdentifier(String(describing: self))
+    }
+
+    let label = NSTextField()
+
+    override func loadView() {
+        view = NSView()
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        label.textColor = .gray
+        label.font = .systemFont(ofSize: 16)
+        label.isEditable = false
+        label.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(label)
+
+        let constraints = [
+            label.topAnchor.constraint(equalTo: view.topAnchor),
+            label.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            label.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            label.trailingAnchor.constraint(equalTo: view.trailingAnchor)
+        ]
+        NSLayoutConstraint.activate(constraints)
+    }
+}
@@ -0,0 +1,81 @@
+import AppKit
+import DiffableDataSources
+
+final class MountainsViewController: NSViewController {
+    enum Section {
+        case main
+    }
+
+    struct Mountain: Hashable {
+        var name: String
+
+        func contains(_ filter: String) -> Bool {
+            guard !filter.isEmpty else {
+                return true
+            }
+
+            let lowercasedFilter = filter.lowercased()
+            return name.lowercased().contains(lowercasedFilter)
+        }
+    }
+
+    @IBOutlet private var searchField: NSSearchField!
+    @IBOutlet private var collectionView: NSCollectionView!
+
+    private lazy var dataSource = CocoaCollectionViewDiffableDataSource<Section, Mountain>(collectionView: collectionView) { collectionView, indexPath, mountain in
+        let item = collectionView.makeItem(withIdentifier: LabelItem.itemIdentifier, for: indexPath) as! LabelItem
+        item.label.stringValue = mountain.name
+        return item
+    }
+
+    private let allMountains: [Mountain] = mountainsRawData.components(separatedBy: .newlines).map { line in
+        let name = line.components(separatedBy: ",")[0]
+        return Mountain(name: name)
+    }
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Mountains Search"
+
+        collectionView.delegate = self
+        collectionView.register(LabelItem.self, forItemWithIdentifier: LabelItem.itemIdentifier)
+
+        search(filter: "")
+    }
+
+    func search(filter: String) {
+        let mountains = allMountains.lazy
+            .filter { $0.contains(filter) }
+            .sorted { $0.name < $1.name }
+
+        let snapshot = DiffableDataSourceSnapshot<Section, Mountain>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(mountains)
+        dataSource.apply(snapshot)
+    }
+
+    @IBAction func searchFieldDidChangeText(_ sender: NSSearchField) {
+        search(filter: sender.stringValue)
+    }
+}
+
+extension MountainsViewController: NSCollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, insetForSectionAt section: Int) -> NSEdgeInsets {
+        return NSEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
+    }
+
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
+        let column = 3
+        let width = (collectionView.bounds.width - 10 * CGFloat(column + 1)) / CGFloat(column)
+        return CGSize(width: width, height: 44)
+    }
+}
@@ -0,0 +1,391 @@
+// https://developer.apple.com/documentation/uikit/views_and_controls/collection_views/using_collection_view_compositional_layouts_and_diffable_data_sources
+
+let mountainsRawData = """
+Mount Everest,8848
+K2,8611
+Kangchenjunga,8586
+Lhotse,8516
+Makalu,8485
+Cho Oyu,8201
+Dhaulagiri,8167
+Manaslu,8163
+Nanga Parbat,8126
+Annapurna,8091
+Gasherbrum I,8080
+Broad Peak,8051
+Gasherbrum II,8035
+Shishapangma,8027
+Gasherbrum III,7952
+Gyachung Kang,7952
+Annapurna II,7937
+Gasherbrum IV,7932
+Himalchuli,7893
+Distaghil Sar,7885
+Ngadi Chuli,7871
+Nuptse,7861
+Khunyang Chhish,7852
+Masherbrum,7821
+Nanda Devi,7816
+Chomo Lonzo,7804
+Batura Sar,7795
+Kanjut Sar,7790
+Rakaposhi,7788
+Namcha Barwa,7782
+Kamet,7756
+Saltoro Kangri,7742
+Jannu,7710
+Tirich Mir,7708
+Molamenqing,7703
+Gurla Mandhata,7694
+Saser Kangri,7672
+Chogolisa,7665
+Kongur Tagh,7649
+Shispare,7611
+Silberzacken,7597
+Changtse,7583
+Trivor,7577
+Gangkhar Puensum,7570
+Gongga Shan,7556
+Annapurna III,7555
+Kula Kangri,7554
+Muztagh Ata,7546
+Skyang Kangri,7545
+Liankang Kangri,7535
+Yukshin Gardan Sar,7530
+Annapurna IV,7525
+Mamostong Kangri,7516
+Ismoil Somoni Peak,7495
+Noshaq,7492
+Pumari Chhish,7492
+Passu Sar,7476
+Malubiting,7458
+Gangapurna,7455
+Muchu Chhish (Batura V),7453
+Jengish Chokusu,7439
+K12,7428
+Sia Kangri,7422
+Istor-o-Nal,7403
+Ghent Kangri,7401
+Haramosh Peak,7397
+Kabru,7394
+Ultar,7388
+Rimo I,7385
+Sherpi Kangri,7380
+Labuche Kang,7367
+Kirat Chuli,7365
+Skil Brum,7360
+Gimmigela Chuli,7350
+Bojohagur Duanasir,7329
+Chamlang,7319
+Jomolhari / Chomolhari,7314
+Baltoro Kangri,7312
+Siguang Ri,7308
+The Crown,7295
+Gyala Peri,7294
+Porong Ri,7292
+Baintha Brakk,7285
+Yutmaru Sar,7283
+K6,7282
+Kangpenqing,7281
+Mana Peak,7272
+Muztagh Tower,7273
+Diran,7257
+Apsarasas Kangri,7245
+Langtang Lirung,7227
+Khartaphu,7213
+Tongshanjiabu,7207
+Langtang Ri,7205
+Kangphu Kang,7204
+Annapurna South,7219
+Melungtse,7181
+Liushi Shan,7167
+Baruntse,7162
+Pumori,7161
+Hardeol,7151
+Gasherbrum V,7147
+Latok I,7145
+Nemjung,7140
+Udren Zom,7140
+Chaukhamba,7138
+Nun Kun,7135
+Tilicho Peak,7134
+Gauri Sankar,7134
+Lenin Peak,7134
+Api,7132
+Pauhunri,7128
+Trisul,7120
+Korzhenevskaya,7105
+Lunpo Gangri,7095
+Satopanth,7075
+Tirsuli,7074
+Dunagiri,7066
+Kangto,7060
+Nyegyi Kansang,7047
+Link Sar,7041
+Kezhen Peak,7038
+Shah Dhar,7038
+Spantik,7027
+Khan Tengri,7010
+Machapuchare,6993
+Laila Peak (Haramosh Valley),6985
+Kang Guru,6981
+Gasherbrum VI,6979
+Karun Kuh,6977
+Avicenna Peak,6974
+Ulugh Muztagh,6973
+Aconcagua,6962
+Napko Kangri,6956
+Kedarnath,6940
+K7,6934
+Panchchuli,6904
+Thalay Sagar,6904
+Lunkho e Dosare,6901
+Lunag Ri,6895
+Ojos del Salado,6891
+Siniolchu,6888
+Kanjiroba,6883
+Bairiga,6882
+Koyo Zom,6872
+Nanda Kot,6861
+Kubi Gangri,6859
+Angel Sar,6858
+Bhagirathi I,6856
+Jethi Bahurani,6850
+Chongra Peak,6830
+Reo Purgyil,6816
+Ama Dablam,6812
+Monte Pissis,6795
+Biarchedi,6781
+Huascarán Sur,6768
+Cerro Bonete,6759
+Nevado Tres Cruces,6748
+Kawagarbo,6740
+Llullaillaco,6739
+Cho Polu,6735
+Kangju Kangri,6725
+Changla,6721
+Mercedario,6720
+Mount Pandim,6691
+Num Ri,6677
+Lungser Kangri,6666
+Meru Peak,6660
+Gul Lasht Zom,6657
+Huascarán Norte,6655
+Khumbutse,6640
+Mount Kailash,6638
+Yerupajá,6635
+Nevado Tres Cruces Central,6629
+Thamserku,6623
+Geladaindong Peak,6621
+Incahuasi,6621
+Pangpoche,6620
+Manirang,6597
+Nilkantha,6596
+Phuparash Peak,6574
+Sickle Moon Peak,6574
+Buni Zom,6542
+Nevado Sajama,6542
+Ghamubar Zom,6518
+Singu Chuli,6501
+Taboche,6501
+Cerro El Muerto,6488
+Mera Peak,6476
+Hiunchuli,6441
+Cholatse,6440
+Illimani,6438
+Ancohuma,6427
+Coropuna,6425
+Antofalla,6409
+Kang Yatze,6400
+Huandoy,6395
+Ausangate,6384
+Illampu,6368
+Kusum Kangguru,6367
+Kinnaur Kailash,6349
+Parinaquta,6348
+Siula Grande,6344
+Bamba Dhura,6334
+Ampato,6288
+Amne Machin,6282
+Pomerape,6282
+Salcantay,6271
+Chimborazo,6267
+Mount Siguniang,6250
+Grid Nie Mountain,6224
+Yuzhu Peak,6224
+Genyen Massif,6204
+Kongde Ri,6187
+Aucanquilcha,6176
+Imja Tse,6189
+Denali (Mt. McKinley),6168
+Stok Kangri,6137
+Lobuche,6119
+Marmolejo,6108
+Laila Peak (Hushe Valley),6096
+Pisang Peak,6091
+Huayna Potosí,6088
+Aracar,6082
+Chachakumani,6074
+Chachani,6057
+Mianzimu,6054
+Acotango,6052
+Socompa,6051
+Acamarachi,6046
+Shayaz,6026
+Hualca Hualca,6025
+Uturunku,6020
+Mitre Peak,6010
+Laila Peak,5971
+Mount Logan,5959
+Alpamayo,5947
+Cerro Lípez,5929
+Licancabur,5920
+Falak Sar,5918
+Cotopaxi,5897
+Mount Kilimanjaro,5895
+Hkakabo Razi,5881
+San José,5856
+El Misti,5822
+Altun Shan,5798
+Cayambe,5790
+Pico Cristóbal Colón,5776
+Antisana,5753
+Nevado Pisco,5752
+Nevado Anallajsi,5750
+Pokalde,5745
+Ubinas,5672
+Pichu Pichu,5664
+Mount Elbrus,5642
+Mehrbani Peak,5639
+Pico de Orizaba,5636
+Mount Damavand,5610
+Nevado Mismi,5597
+Jade Dragon Snow Mountain,5596
+Lascar Volcano,5592
+Mount Xuebaoding,5588
+Kala Patthar,5545
+Mount Saint Elias,5489
+Concord Peak,5469
+Machoi Peak,5458
+El Plomo,5450
+Bogda Feng,5445
+Mount Little Xuebaoding,5443
+Cerro El Plomo,5434
+Popocatépetl,5426
+Kolahoi Peak,5425
+Chacaltaya,5421
+Mount Pomiu,5413
+Ritacuba Blanco,5410
+Haba Xueshan,5396
+Nevado del Ruiz,5389
+Nevado del Huila,5364
+El Altar,5320
+Mount Foraker,5304
+Mount Haramukh,5300
+Nevado del Tolima,5276
+Maipo,5264
+Illiniza,5248
+Sirbal Peak,5236
+Sangay,5230
+Iztaccíhuatl,5230
+Mount Lucania,5226
+Dykh-Tau,5205
+Shkhara,5201
+Mount Kenya,5199
+Malika Parbat,5190
+Amarnath Peak,5186
+King Peak,5173
+Boris Yeltsin Peak,5168
+Koshtan-Tau,5150
+Mount Ararat,5137
+Mount Stanley,5109
+Mount Steele,5073
+Janga,5051
+Mount Kazbek,5047
+Tungurahua,5023
+Carihuairazo,5018
+Mount Bona,5005
+Mount Blackburn,4996
+Pico Bolívar,4981
+Pik Talgar,4979
+Shota Rustaveli Peak,4960
+Gunshar,4950
+Mount Sanford,4949
+Pico Humboldt,4940
+Vinson Massif,4892
+Pico Bonpland,4890
+Puncak Jaya,4884
+Pico La Concha,4870
+Gistola,4860
+Tetnuldi,4858
+Mount Tyree,4852
+Huaynaputina,4850
+Alam Kuh,4850
+Mount Wood,4842
+Mount Vancouver,4812
+Sabalan,4811
+Mont Blanc,4810
+Corazón,4790
+Pichincha,4784
+Jimara,4780
+Mount Churchill,4766
+Puncak Mandala,4760
+Klyuchevskaya Sopka,4750
+Puncak Trikora,4750
+Mont Blanc de Courmayeur,4748
+Sunset Peak,4745
+Mount Slaggard,4742
+Pico Piedras Blancas,4740
+Pico El Toro,4730
+Tatakooti Peak,4725
+Rumiñahui,4721
+Pico El Leon,4720
+Ushba,4710
+Volcán Domuyo,4709
+Pico Los Nevados,4700
+Pico Pan de Azucar,4680
+Naltar Peak,4678
+Mount Fairweather,4663
+Pico Mucuñuque,4660
+Pico El Buitre,4650
+Khazret Sultan,4643
+Sierra Negra,4640
+Dufourspitze (Monte Rosa),4634
+Dunantspitze (Monte Rosa),4632
+Nordend (Monte Rosa),4609
+Mount Hubbard,4577
+Nevado de Toluca,4577
+Mount Meru,4566
+Zumsteinspitze (Monte Rosa),4563
+Signalkuppe (Monte Rosa),4554
+Dom,4545
+Ras Dashen,4533
+Eastern Liskamm (Lyskamm),4527
+Mount Bear,4521
+Mount Wilhelm,4509
+Mount Karisimbi,4507
+Mount Walsh,4507
+Belukha Mountain,4506
+Weisshorn,4506
+Tebulosmta,4493
+Täschhorn,4491
+Bazarduzu Dagi,4485
+Matterhorn,4478
+Mount Rutford,4477
+Mont Maudit,4465
+Babis Mta,4454
+Mount Shani,4451
+Dena,4448
+Vladimir Putin Peak,4446
+Mount Hunter,4442
+Parrotspitze (Monte Rosa),4432
+Mount Whitney,4421
+Mount Alverstone,4420
+University Peak,4411
+Aello Peak,4403
+Mount Elbert,4402
+Mount Massive,4395
+Mount Harvard,4395
+Mount Rainier,4392
+Kholeno,4387
+"""
@@ -0,0 +1,10 @@
+<H1 align="center">
+DiffableDataSources Examples
+</H1>
+
+## How to Run
+
+1. Clone the DiffableDataSources repository.
+1. Checkout the dependencies using terminal command `$ make setup` at the project root directory.
+1. Open example project workspace.
+1. Run.
@@ -0,0 +1,4 @@
+source "https://rubygems.org"
+
+gem 'cocoapods', '1.7.2'
+gem 'jazzy', '0.9.4'
@@ -0,0 +1,103 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    CFPropertyList (3.0.0)
+    activesupport (4.2.11.1)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    atomos (0.1.3)
+    claide (1.0.2)
+    cocoapods (1.7.2)
+      activesupport (>= 4.0.2, < 5)
+      claide (>= 1.0.2, < 2.0)
+      cocoapods-core (= 1.7.2)
+      cocoapods-deintegrate (>= 1.0.3, < 2.0)
+      cocoapods-downloader (>= 1.2.2, < 2.0)
+      cocoapods-plugins (>= 1.0.0, < 2.0)
+      cocoapods-search (>= 1.0.0, < 2.0)
+      cocoapods-stats (>= 1.0.0, < 2.0)
+      cocoapods-trunk (>= 1.3.1, < 2.0)
+      cocoapods-try (>= 1.1.0, < 2.0)
+      colored2 (~> 3.1)
+      escape (~> 0.0.4)
+      fourflusher (>= 2.3.0, < 3.0)
+      gh_inspector (~> 1.0)
+      molinillo (~> 0.6.6)
+      nap (~> 1.0)
+      ruby-macho (~> 1.4)
+      xcodeproj (>= 1.10.0, < 2.0)
+    cocoapods-core (1.7.2)
+      activesupport (>= 4.0.2, < 6)
+      fuzzy_match (~> 2.0.4)
+      nap (~> 1.0)
+    cocoapods-deintegrate (1.0.4)
+    cocoapods-downloader (1.2.2)
+    cocoapods-plugins (1.0.0)
+      nap
+    cocoapods-search (1.0.0)
+    cocoapods-stats (1.1.0)
+    cocoapods-trunk (1.3.1)
+      nap (>= 0.8, < 2.0)
+      netrc (~> 0.11)
+    cocoapods-try (1.1.0)
+    colored2 (3.1.2)
+    concurrent-ruby (1.1.5)
+    escape (0.0.4)
+    ffi (1.11.1)
+    fourflusher (2.3.0)
+    fuzzy_match (2.0.4)
+    gh_inspector (1.1.3)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jazzy (0.9.4)
+      cocoapods (~> 1.0)
+      mustache (~> 0.99)
+      open4
+      redcarpet (~> 3.2)
+      rouge (>= 2.0.6, < 4.0)
+      sass (~> 3.4)
+      sqlite3 (~> 1.3)
+      xcinvoke (~> 0.3.0)
+    liferaft (0.0.6)
+    minitest (5.11.3)
+    molinillo (0.6.6)
+    mustache (0.99.8)
+    nanaimo (0.2.6)
+    nap (1.1.0)
+    netrc (0.11.0)
+    open4 (1.3.4)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    redcarpet (3.4.0)
+    rouge (3.4.1)
+    ruby-macho (1.4.0)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sqlite3 (1.4.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    xcinvoke (0.3.0)
+      liferaft (~> 0.0.6)
+    xcodeproj (1.10.0)
+      CFPropertyList (>= 2.3.3, < 4.0)
+      atomos (~> 0.1.3)
+      claide (>= 1.0.2, < 2.0)
+      colored2 (~> 3.1)
+      nanaimo (~> 0.2.6)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cocoapods (= 1.7.2)
+  jazzy (= 0.9.4)
+
+BUNDLED WITH
+   2.0.1
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
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+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
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+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
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+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
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+      copyright license to reproduce, prepare Derivative Works of,
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+      or a Contribution incorporated within the Work constitutes direct
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+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   8. Limitation of Liability. In no event and under no legal theory,
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+      defend, and hold each Contributor harmless for any liability
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
@@ -0,0 +1,17 @@
+setup:
+	git submodule update --init --recursive
+
+carthage-submodule:
+	carthage update --no-build --use-submodules
+
+gems-install:
+	bundle install --path vendor/bundle
+
+docs-gen:
+	bundle exec jazzy --config .jazzy.yml
+
+lib-lint:
+	bundle exec pod lib lint
+
+pod-release:
+	bundle exec pod trunk push --allow-warnings
@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "DifferenceKit",
+        "repositoryURL": "https://github.com/ra1028/DifferenceKit.git",
+        "state": {
+          "branch": null,
+          "revision": "4eb31f8e85e4cb13732f9664d6e01e507cd592a0",
+          "version": "1.1.3"
+        }
+      }
+    ]
+  },
+  "version": 1
+}
@@ -0,0 +1,29 @@
+// swift-tools-version:5.0
+
+import PackageDescription
+
+let package = Package(
+    name: "DiffableDataSources",
+    platforms: [
+        .iOS(.v9), .macOS(.v10_11), .tvOS(.v9)
+    ],
+    products: [
+        .library(name: "DiffableDataSources", targets: ["DiffableDataSources"])
+    ],
+    dependencies: [
+        .package(url: "https://github.com/ra1028/DifferenceKit.git", .upToNextMinor(from: "1.1.0"))
+    ],
+    targets: [
+        .target(
+            name: "DiffableDataSources",
+            dependencies: ["DifferenceKit"],
+            path: "Sources"
+        ),
+        .testTarget(
+            name: "DiffableDataSourcesTests",
+            dependencies: ["DiffableDataSources"],
+            path: "Tests"
+        )
+    ],
+    swiftLanguageVersions: [.v5]
+)
@@ -0,0 +1,208 @@
+<H1 align="center">
+DiffableDataSources
+</H1>
+<H4 align="center">
+💾 A library for backporting UITableView/UICollectionViewDiffableDataSource</br>
+powered by <a href="https://github.com/ra1028/DifferenceKit">DifferenceKit</a>.
+</H4>
+
+<p align="center">
+<a href="https://developer.apple.com/swift"><img alt="Swift5" src="https://img.shields.io/badge/language-Swift5-orange.svg"/></a>
+<a href="https://github.com/ra1028/DiffableDataSources/releases/latest"><img alt="Release" src="https://img.shields.io/github/release/ra1028/DiffableDataSources.svg"/></a>
+<a href="https://cocoapods.org/pods/DiffableDataSources"><img alt="CocoaPods" src="https://img.shields.io/cocoapods/v/DiffableDataSources.svg"/></a>
+<a href="https://github.com/Carthage/Carthage"><img alt="Carthage" src="https://img.shields.io/badge/carthage-compatible-yellow.svg"/></a>
+<a href="https://swift.org/package-manager"><img alt="Swift Package Manager" src="https://img.shields.io/badge/SwiftPM-compatible-yellowgreen.svg"/></a>
+</br>
+<a href="https://dev.azure.com/ra1028/GitHub/_build/latest?definitionId=3&branchName=master"><img alt="Build Status" src="https://dev.azure.com/ra1028/GitHub/_apis/build/status/ra1028.DiffableDataSources?branchName=master"/></a>
+<a href="https://developer.apple.com/"><img alt="Platform" src="https://img.shields.io/badge/platform-iOS%20%7C%20macOS%20%7C%20tvOS-green.svg"/></a>
+<a href="https://github.com/ra1028/DiffableDataSources/blob/master/LICENSE"><img alt="Lincense" src="https://img.shields.io/badge/License-Apache%202.0-black.svg"/></a>
+</p>
+
+<p align="center">
+Made with ❤️ by <a href="https://github.com/ra1028">Ryo Aoyama</a>
+</p>
+
+---
+
+## Introduction
+
+<img src="https://raw.githubusercontent.com/ra1028/DiffableDataSources/master/assets/insertion_sort.gif" height="400" align="right">
+<img src="https://raw.githubusercontent.com/ra1028/DiffableDataSources/master/assets/mountains.gif" height="400" align="right">
+
+Apple has announced a diffable data source at WWDC 2019.  
+It's a great API that easily updating our table view and collection view items using automatic diffing.  
+However, it's a little while before we can use it in a production service.  
+That because it requires the latest OS to use.  
+DiffableDataSources make it possible to introduce almost the same functionality from now on.  
+
+Uses a sophisticated open source [DifferenceKit](https://github.com/ra1028/DifferenceKit) for the algorithm engine.  
+It's extremely fast and completely avoids synchronization bugs, exceptions, and crashes.  
+
+<br clear="all">
+
+---
+
+## Difference from the Official
+
+#### Spec
+
+- Supports iOS 9.0+ / macOS 10.11+ / tvOS 9.0+
+- Open sourced algorithm.
+- Duplicate sections or items are allowed.  
+- Using `performBatchUpdates` for diffing updates.
+
+#### Namings
+
+`DiffableDataSources` have different class names to avoid conflicts with the official API.  
+Correspondence table is below.  
+
+|Official                                                                    |Backported                           |
+|:---------------------------------------------------------------------------|:------------------------------------|
+|[NSDiffableDataSourceSnapshot][NSDiffableDataSourceSnapshot_doc]            |DiffableDataSourceSnapshot           |
+|[UITableViewDiffableDataSource][UITableViewDiffableDataSource_doc]          |TableViewDiffableDataSource          |
+|[UICollectionViewDiffableDataSource][UICollectionViewDiffableDataSource_doc]|CollectionViewDiffableDataSource     |
+|[NSCollectionViewDiffableDataSource][NSCollectionViewDiffableDataSource_doc]|CocoaCollectionViewDiffableDataSource|
+
+[NSDiffableDataSourceSnapshot_doc]: https://developer.apple.com/documentation/uikit/uitableviewdiffabledatasource
+[UITableViewDiffableDataSource_doc]: https://developer.apple.com/documentation/uikit/uitableviewdiffabledatasource
+[UICollectionViewDiffableDataSource_doc]: https://developer.apple.com/documentation/uikit/uicollectionviewdiffabledatasource
+[NSCollectionViewDiffableDataSource_doc]: https://developer.apple.com/documentation/appkit/nscollectionviewdiffabledatasource
+
+---
+
+## Getting Started
+
+- [API Documentation](https://ra1028.github.io/DiffableDataSources)
+- [Example Apps](https://github.com/ra1028/DiffableDataSources/tree/master/Examples)
+- [WWDC 2019 Session](https://developer.apple.com/videos/play/wwdc2019/220)
+
+#### Build Project
+
+```sh
+$ git clone https://github.com/ra1028/DiffableDataSources.git
+$ cd DiffableDataSources/
+$ make setup
+$ open DiffableDataSources.xcworkspace
+```
+
+---
+
+## Basic Usage
+
+First, define the type representing section.  
+It should conforms to `Hashable` for identifies from the all sections.  
+Type of enum can used conveniently befause it conforms `Hashable` by default.  
+
+```swift
+enum Section {
+    case main
+}
+```
+
+Then, define the item type conforms to `Hashable`.  
+
+```swift
+struct User: Hashable {
+    var name: String
+}
+```
+
+Create a data source object, it will be set to table view automatically.  
+You should dequeue the non nil cells via closure.  
+
+```swift
+final class UsersViewController: UIViewController {
+    let tableView: UITableView = ...
+
+    lazy var dataSource = TableViewDiffableDataSource<Section, User>(tableView: tableView) { tableView, indexPath, user in
+        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
+        cell.textLabel?.text = user.name
+        return cell
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
+    }
+}
+```
+
+Manages and updates the data sources intuitively by intermediating `DiffableDataSourceSnapshot`.  
+The UI isn't updated until you apply the edited snapshot object.  
+Update the UI with diffing animation automatically calculated by applying an edited snapshot.  
+
+```swift
+let users = [
+    User(name: "Steve Jobs"),
+    User(name: "Stephen Wozniak"),
+    User(name: "Tim Cook"),
+    User(name: "Jonathan Ive")
+]
+
+let snapshot = DiffableDataSourceSnapshot<Section, User>()
+snapshot.appendSections([.main])
+snapshot.appendItems(users)
+
+dataSource.apply(snapshot)
+```
+
+Check the documentation for more detailed API.  
+
+<H3 align="center">
+<a href="https://ra1028.github.io/DiffableDataSources">[See More Usage]</a>
+</H3>
+
+---
+
+## Requirements
+
+- Swift 5.0+
+- iOS 9.0+
+- macOS 10.11+
+- tvOS 9.0+
+
+---
+
+## Installation
+
+### [CocoaPods](https://cocoapods.org)
+Add the following to your `Podfile`:
+```ruby
+pod 'DiffableDataSources'
+```
+
+### [Carthage](https://github.com/Carthage/Carthage)
+Add the following to your `Cartfile`:
+```
+github "ra1028/DiffableDataSources"
+```
+
+### [Swift Package Manager](https://swift.org/package-manager/)
+Add the following to the dependencies of your `Package.swift`:
+```swift
+.package(url: "https://github.com/ra1028/DiffableDataSources.git", from: "x.x.x")
+```
+
+---
+
+## Contributing
+
+Pull requests, bug reports and feature requests are welcome 🚀  
+Please see the [CONTRIBUTING](https://github.com/ra1028/DiffableDataSources/blob/master/CONTRIBUTING.md) file for learn how to contribute to DiffableDataSources.  
+
+---
+
+## Relations
+
+#### [DifferenceKit](https://github.com/ra1028/DifferenceKit)  
+A fast and flexible O(n) difference algorithm framework for Swift collection.
+
+#### [Carbon](https://github.com/ra1028/Carbon)  
+A declarative library for building component-based user interfaces in UITableView and UICollectionView.
+
+---
+
+## License
+
+DiffableDataSources is released under the [Apache 2.0 License](https://github.com/ra1028/DiffableDataSources/blob/master/LICENSE).  
@@ -0,0 +1,111 @@
+#if os(macOS)
+
+import AppKit
+import DifferenceKit
+
+/// A class for backporting `NSCollectionViewDiffableDataSource` introduced in macOS 10.15+.
+/// Represents the data model object for `NSCollectionView` that can be applies the
+/// changes with automatic diffing.
+open class CocoaCollectionViewDiffableDataSource<SectionIdentifierType: Hashable, ItemIdentifierType: Hashable>: NSObject, NSCollectionViewDataSource {
+    /// The type of closure providing the item.
+    public typealias ItemProvider = (NSCollectionView, IndexPath, ItemIdentifierType) -> NSCollectionViewItem?
+
+    private weak var collectionView: NSCollectionView?
+    private let itemProvider: ItemProvider
+    private let core = DiffableDataSourceCore<SectionIdentifierType, ItemIdentifierType>()
+
+    /// Creates a new data source.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance to be managed.
+    ///   - itemProvider: A closure to make the item.
+    public init(collectionView: NSCollectionView, itemProvider: @escaping ItemProvider) {
+        self.collectionView = collectionView
+        self.itemProvider = itemProvider
+        super.init()
+
+        collectionView.dataSource = self
+    }
+
+    /// Applies given snapshot to perform automatic diffing update.
+    ///
+    /// - Parameters:
+    ///   - snapshot: A snapshot object to be applied to data model.
+    ///   - animatingDifferences: A Boolean value indicating whether to update with
+    ///                           diffing animation.
+    public func apply(_ snapshot: DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>, animatingDifferences: Bool = true) {
+        core.apply(
+            snapshot,
+            view: collectionView,
+            animatingDifferences: animatingDifferences,
+            performUpdates: { collectionView, changeset, setSections in
+                collectionView.reload(using: changeset, setData: setSections)
+        })
+    }
+
+    /// Returns a new snapshot object of current state.
+    ///
+    /// - Returns: A new snapshot object of current state.
+    public func snapshot() -> DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType> {
+        return core.snapshot()
+    }
+
+    /// Returns an item identifier for given index path.
+    ///
+    /// - Parameters:
+    ///   - indexPath: An index path for the item identifier.
+    ///
+    /// - Returns: An item identifier for given index path.
+    public func itemIdentifier(for indexPath: IndexPath) -> ItemIdentifierType? {
+        return core.itemIdentifier(for: indexPath)
+    }
+
+    /// Returns an index path for given item identifier.
+    ///
+    /// - Parameters:
+    ///   - itemIdentifier: An identifier of item.
+    ///
+    /// - Returns: An index path for given item identifier.
+    public func indexPath(for itemIdentifier: ItemIdentifierType) -> IndexPath? {
+        return core.indexPath(for: itemIdentifier)
+    }
+
+    /// Returns the number of sections in the data source.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///
+    /// - Returns: The number of sections in the data source.
+    public func numberOfSections(in collectionView: NSCollectionView) -> Int {
+        return core.numberOfSections()
+    }
+
+    /// Returns the number of items in the specified section.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///   - section: An index of section.
+    ///
+    /// - Returns: The number of items in the specified section.
+    public func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
+        return core.numberOfItems(inSection: section)
+    }
+
+    /// Returns an item at specified index path.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///   - indexPath: An index path for item.
+    ///
+    /// - Returns: An item at specified index path.
+    open func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
+        let itemIdentifier = core.unsafeItemIdentifier(for: indexPath)
+        guard let item = itemProvider(collectionView, indexPath, itemIdentifier) else {
+            universalError("NSCollectionView dataSource returned a nil item at index path: \(indexPath), collectionView: \(collectionView), itemIdentifier: \(itemIdentifier)")
+        }
+
+        return item
+    }
+}
+
+#endif
@@ -0,0 +1,204 @@
+/// A class for backporting `NSDiffableDataSourceSnapshot` introduced in iOS 13.0+, macOS 10.15+, tvOS 13.0+.
+/// Represents the mutable state of diffable data source of UI.
+public class DiffableDataSourceSnapshot<SectionIdentifierType: Hashable, ItemIdentifierType: Hashable> {
+    internal let structure = SnapshotStructure<SectionIdentifierType, ItemIdentifierType>()
+
+    /// Creates a new empty snapshot object.
+    public init() {}
+
+    /// The number of item identifiers in the snapshot.
+    public var numberOfItems: Int {
+        return itemIdentifiers.count
+    }
+
+    /// The number of section identifiers in the snapshot.
+    public var numberOfSections: Int {
+        return sectionIdentifiers.count
+    }
+
+    /// All section identifiers in the snapshot.
+    public var sectionIdentifiers: [SectionIdentifierType] {
+        return structure.allSectionIDs
+    }
+
+    /// All item identifiers in the snapshot.
+    public var itemIdentifiers: [ItemIdentifierType] {
+        return structure.allItemIDs
+    }
+
+    /// Returns the number of item identifiers in the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifier: An identifier of section.
+    ///
+    /// - Returns: The number of item identifiers in the specified section.
+    public func numberOfItems(inSection identifier: SectionIdentifierType) -> Int {
+        return itemIdentifiers(inSection: identifier).count
+    }
+
+    /// Returns the item identifiers in the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifier: An identifier of section.
+    ///
+    /// - Returns: The item identifiers in the specified section.
+    public func itemIdentifiers(inSection identifier: SectionIdentifierType) -> [ItemIdentifierType] {
+        return structure.items(in: identifier)
+    }
+
+    /// Returns a section identifier containing the specified item.
+    ///
+    /// - Parameters:
+    ///   - identifier: An identifier of item.
+    ///
+    /// - Returns: A section identifier containing the specified item.
+    public func sectionIdentifier(containingItem identifier: ItemIdentifierType) -> SectionIdentifierType? {
+        return structure.section(containing: identifier)
+    }
+
+    /// Returns an index of the specified item.
+    ///
+    /// - Parameters:
+    ///   - identifier: An identifier of item.
+    ///
+    /// - Returns: An index of the specified item.
+    public func indexOfItem(_ identifier: ItemIdentifierType) -> Int? {
+        return itemIdentifiers.firstIndex { $0.isEqualHash(to: identifier) }
+    }
+
+    /// Returns an index of the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifier: An identifier of section.
+    ///
+    /// - Returns: An index of the specified section.
+    public func indexOfSection(_ identifier: SectionIdentifierType) -> Int? {
+        return sectionIdentifiers.firstIndex { $0.isEqualHash(to: identifier) }
+    }
+
+    /// Appends the given item identifiers to the specified section or last section.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The item identifiers to be appended.
+    ///   - sectionIdentifier: An identifier of section to append the given identiciers.
+    public func appendItems(_ identifiers: [ItemIdentifierType], toSection sectionIdentifier: SectionIdentifierType? = nil) {
+        structure.append(itemIDs: identifiers, to: sectionIdentifier)
+    }
+
+    /// Inserts the given item identifiers before the specified item.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The item identifiers to be inserted.
+    ///   - beforeIdentifier: An identifier of item.
+    public func insertItems(_ identifiers: [ItemIdentifierType], beforeItem beforeIdentifier: ItemIdentifierType) {
+        structure.insert(itemIDs: identifiers, before: beforeIdentifier)
+    }
+
+    /// Inserts the given item identifiers after the specified item.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The item identifiers to be inserted.
+    ///   - afterIdentifier: An identifier of item.
+    public func insertItems(_ identifiers: [ItemIdentifierType], afterItem afterIdentifier: ItemIdentifierType) {
+        structure.insert(itemIDs: identifiers, after: afterIdentifier)
+    }
+
+    /// Deletes the specified items.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The item identifiers to be deleted.
+    public func deleteItems(_ identifiers: [ItemIdentifierType]) {
+        structure.remove(itemIDs: identifiers)
+    }
+
+    /// Deletes the all items in the snapshot.
+    public func deleteAllItems() {
+        structure.removeAllItems()
+    }
+
+    /// Moves the given item identifier before the specified item.
+    ///
+    /// - Parameters:
+    ///   - identifier: An item identifier to be moved.
+    ///   - toIdentifier: An identifier of item.
+    public func moveItem(_ identifier: ItemIdentifierType, beforeItem toIdentifier: ItemIdentifierType) {
+        structure.move(itemID: identifier, before: toIdentifier)
+    }
+
+    /// Moves the given item identifier after the specified item.
+    ///
+    /// - Parameters:
+    ///   - identifier: An item identifier to be moved.
+    ///   - toIdentifier: An identifier of item.
+    public func moveItem(_ identifier: ItemIdentifierType, afterItem toIdentifier: ItemIdentifierType) {
+        structure.move(itemID: identifier, after: toIdentifier)
+    }
+
+    /// Reloads the specified items.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The item identifiers to be reloaded.
+    public func reloadItems(_ identifiers: [ItemIdentifierType]) {
+        structure.update(itemIDs: identifiers)
+    }
+
+    /// Appends the given section identifiers to the end of sections.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The section identifiers to be appended.
+    public func appendSections(_ identifiers: [SectionIdentifierType]) {
+        structure.append(sectionIDs: identifiers)
+    }
+
+    /// Inserts the given section identifiers before the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The section identifiers to be inserted.
+    ///   - toIdentifier: An identifier of setion.
+    public func insertSections(_ identifiers: [SectionIdentifierType], beforeSection toIdentifier: SectionIdentifierType) {
+        structure.insert(sectionIDs: identifiers, before: toIdentifier)
+    }
+
+    /// Inserts the given section identifiers after the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The section identifiers to be inserted.
+    ///   - toIdentifier: An identifier of setion.
+    public func insertSections(_ identifiers: [SectionIdentifierType], afterSection toIdentifier: SectionIdentifierType) {
+        structure.insert(sectionIDs: identifiers, after: toIdentifier)
+    }
+
+    /// Deletes the specified sections.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The section identifiers to be deleted.
+    public func deleteSections(_ identifiers: [SectionIdentifierType]) {
+        structure.remove(sectionIDs: identifiers)
+    }
+
+    /// Moves the given section identifier before the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifier: A section identifier to be moved.
+    ///   - toIdentifier: An identifier of section.
+    public func moveSection(_ identifier: SectionIdentifierType, beforeSection toIdentifier: SectionIdentifierType) {
+        structure.move(sectionID: identifier, before: toIdentifier)
+    }
+
+    /// Moves the given section identifier after the specified section.
+    ///
+    /// - Parameters:
+    ///   - identifier: A section identifier to be moved.
+    ///   - toIdentifier: An identifier of section.
+    public func moveSection(_ identifier: SectionIdentifierType, afterSection toIdentifier: SectionIdentifierType) {
+        structure.move(sectionID: identifier, after: toIdentifier)
+    }
+
+    /// Reloads the specified sections.
+    ///
+    /// - Parameters:
+    ///   - identifiers: The section identifiers to be reloaded.
+    public func reloadSections(_ identifiers: [SectionIdentifierType]) {
+        structure.update(sectionIDs: identifiers)
+    }
+}
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+</dict>
+</plist>
@@ -0,0 +1,98 @@
+import Foundation
+import QuartzCore
+import DifferenceKit
+
+final class DiffableDataSourceCore<SectionIdentifierType: Hashable, ItemIdentifierType: Hashable> {
+    typealias Section = SnapshotStructure<SectionIdentifierType, ItemIdentifierType>.Section
+
+    private let dispatcher = MainThreadSerialDispatcher()
+    private var currentSnapshot = DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>()
+    private var sections: [Section] = []
+
+    func apply<View: AnyObject>(
+        _ snapshot: DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>,
+        view: View?,
+        animatingDifferences: Bool,
+        performUpdates: @escaping (View, StagedChangeset<[Section]>, @escaping ([Section]) -> Void) -> Void
+        ) {
+        dispatcher.dispatch { [weak self] in
+            guard let self = self else {
+                return
+            }
+
+            self.currentSnapshot = snapshot
+
+            let newSections = snapshot.structure.sections
+
+            guard let view = view else {
+                return self.sections = newSections
+            }
+
+            func performDiffingUpdates() {
+                let changeset = StagedChangeset(source: self.sections, target: newSections)
+                performUpdates(view, changeset) { sections in
+                    self.sections = sections
+                }
+            }
+
+            if animatingDifferences {
+                performDiffingUpdates()
+            }
+            else {
+                CATransaction.begin()
+                CATransaction.setDisableActions(true)
+                performDiffingUpdates()
+                CATransaction.commit()
+            }
+        }
+    }
+
+    func snapshot() -> DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType> {
+        let snapshot = DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>()
+        snapshot.structure.sections = currentSnapshot.structure.sections
+        return snapshot
+    }
+
+    func itemIdentifier(for indexPath: IndexPath) -> ItemIdentifierType? {
+        guard 0..<sections.endIndex ~= indexPath.section else {
+            return nil
+        }
+
+        let items = sections[indexPath.section].elements
+
+        guard 0..<items.endIndex ~= indexPath.item else {
+            return nil
+        }
+
+        return items[indexPath.item].differenceIdentifier
+    }
+
+    func unsafeItemIdentifier(for indexPath: IndexPath, file: StaticString = #file, line: UInt = #line) -> ItemIdentifierType {
+        guard let itemIdentifier = itemIdentifier(for: indexPath) else {
+            universalError("Item not found at the specified index path(\(indexPath)).")
+        }
+
+        return itemIdentifier
+    }
+
+    func indexPath(for itemIdentifier: ItemIdentifierType) -> IndexPath? {
+        let indexPathMap: [ItemIdentifierType: IndexPath] = sections.enumerated()
+            .reduce(into: [:]) { result, section in
+                for (itemIndex, item) in section.element.elements.enumerated() {
+                    result[item.differenceIdentifier] = IndexPath(
+                        item: itemIndex,
+                        section: section.offset
+                    )
+                }
+        }
+        return indexPathMap[itemIdentifier]
+    }
+
+    func numberOfSections() -> Int {
+        return sections.count
+    }
+
+    func numberOfItems(inSection section: Int) -> Int {
+        return sections[section].elements.count
+    }
+}
@@ -0,0 +1,5 @@
+extension Hashable {
+    func isEqualHash(to other: Self) -> Bool {
+        return hashValue == other.hashValue && self == other
+    }
+}
@@ -0,0 +1,33 @@
+import Foundation
+
+final class MainThreadSerialDispatcher {
+    private let executingCount = UnsafeMutablePointer<Int32>.allocate(capacity: 1)
+
+    init() {
+        executingCount.initialize(to: 0)
+    }
+
+    deinit {
+        executingCount.deinitialize(count: 1)
+        executingCount.deallocate()
+    }
+
+    func dispatch(_ action: @escaping () -> Void) {
+        let count = OSAtomicIncrement32(executingCount)
+
+        if Thread.isMainThread && count == 1 {
+            action()
+            OSAtomicDecrement32(executingCount)
+        }
+        else {
+            DispatchQueue.main.async { [weak self] in
+                guard let self = self else {
+                    return
+                }
+
+                action()
+                OSAtomicDecrement32(self.executingCount)
+            }
+        }
+    }
+}
@@ -0,0 +1,294 @@
+import Foundation
+import DifferenceKit
+
+final class SnapshotStructure<SectionID: Hashable, ItemID: Hashable> {
+    struct Item: Differentiable, Equatable {
+        var differenceIdentifier: ItemID
+        var isReloaded: Bool
+
+        init(id: ItemID, isReloaded: Bool) {
+            self.differenceIdentifier = id
+            self.isReloaded = isReloaded
+        }
+
+        init(id: ItemID) {
+            self.init(id: id, isReloaded: false)
+        }
+
+        func isContentEqual(to source: Item) -> Bool {
+            return !isReloaded && differenceIdentifier == source.differenceIdentifier
+        }
+    }
+
+    struct Section: DifferentiableSection, Equatable {
+        var differenceIdentifier: SectionID
+        var elements: [Item] = []
+        var isReloaded: Bool
+
+        init(id: SectionID, items: [Item], isReloaded: Bool) {
+            self.differenceIdentifier = id
+            self.elements = items
+            self.isReloaded = isReloaded
+        }
+
+        init(id: SectionID) {
+            self.init(id: id, items: [], isReloaded: false)
+        }
+
+        init<C: Collection>(source: Section, elements: C) where C.Element == Item {
+            self.init(id: source.differenceIdentifier, items: Array(elements), isReloaded: source.isReloaded)
+        }
+
+        func isContentEqual(to source: Section) -> Bool {
+            return !isReloaded && differenceIdentifier == source.differenceIdentifier
+        }
+    }
+
+    var sections: [Section] = []
+
+    var allSectionIDs: [SectionID] {
+        return sections.map { $0.differenceIdentifier }
+    }
+
+    var allItemIDs: [ItemID] {
+        return sections.lazy
+            .flatMap { $0.elements }
+            .map { $0.differenceIdentifier }
+    }
+
+    func items(in sectionID: SectionID, file: StaticString = #file, line: UInt = #line) -> [ItemID] {
+        guard let sectionIndex = sectionIndex(of: sectionID) else {
+            specifiedSectionIsNotFound(sectionID, file: file, line: line)
+        }
+
+        return sections[sectionIndex].elements.map { $0.differenceIdentifier }
+    }
+
+    func section(containing itemID: ItemID) -> SectionID? {
+        return itemPositionMap()[itemID]?.section.differenceIdentifier
+    }
+
+    func append(itemIDs: [ItemID], to sectionID: SectionID? = nil, file: StaticString = #file, line: UInt = #line) {
+        let index: Array<Section>.Index
+
+        if let sectionID = sectionID {
+            guard let sectionIndex = sectionIndex(of: sectionID) else {
+                specifiedSectionIsNotFound(sectionID, file: file, line: line)
+            }
+
+            index = sectionIndex
+        }
+        else {
+            guard !sections.isEmpty else {
+                thereAreCurrentlyNoSections(file: file, line: line)
+            }
+
+            index = sections.index(before: sections.endIndex)
+        }
+
+        let items = itemIDs.lazy.map(Item.init)
+        sections[index].elements.append(contentsOf: items)
+    }
+
+    func insert(itemIDs: [ItemID], before beforeItemID: ItemID, file: StaticString = #file, line: UInt = #line) {
+        guard let itemPosition = itemPositionMap()[beforeItemID] else {
+            specifiedItemIsNotFound(beforeItemID, file: file, line: line)
+        }
+
+        let items = itemIDs.lazy.map(Item.init)
+        sections[itemPosition.sectionIndex].elements.insert(contentsOf: items, at: itemPosition.itemRelativeIndex)
+    }
+
+    func insert(itemIDs: [ItemID], after afterItemID: ItemID, file: StaticString = #file, line: UInt = #line) {
+        guard let itemPosition = itemPositionMap()[afterItemID] else {
+            specifiedItemIsNotFound(afterItemID, file: file, line: line)
+        }
+
+        let itemIndex = sections[itemPosition.sectionIndex].elements.index(after: itemPosition.itemRelativeIndex)
+        let items = itemIDs.lazy.map(Item.init)
+        sections[itemPosition.sectionIndex].elements.insert(contentsOf: items, at: itemIndex)
+    }
+
+    func remove(itemIDs: [ItemID]) {
+        let itemPositionMap = self.itemPositionMap()
+        var removeIndexSetMap = [Int: IndexSet]()
+
+        for itemID in itemIDs {
+            guard let itemPosition = itemPositionMap[itemID] else {
+                continue
+            }
+
+            removeIndexSetMap[itemPosition.sectionIndex, default: []].insert(itemPosition.itemRelativeIndex)
+        }
+
+        for (sectionIndex, removeIndexSet) in removeIndexSetMap {
+            for range in removeIndexSet.rangeView.reversed() {
+                sections[sectionIndex].elements.removeSubrange(range)
+            }
+        }
+    }
+
+    func removeAllItems() {
+        for sectionIndex in sections.indices {
+            sections[sectionIndex].elements.removeAll()
+        }
+    }
+
+    func move(itemID: ItemID, before beforeItemID: ItemID, file: StaticString = #file, line: UInt = #line) {
+        guard let removed = remove(itemID: itemID) else {
+            specifiedItemIsNotFound(itemID, file: file, line: line)
+        }
+
+        guard let itemPosition = itemPositionMap()[beforeItemID] else {
+            specifiedItemIsNotFound(beforeItemID, file: file, line: line)
+        }
+
+        sections[itemPosition.sectionIndex].elements.insert(removed, at: itemPosition.itemRelativeIndex)
+    }
+
+    func move(itemID: ItemID, after afterItemID: ItemID, file: StaticString = #file, line: UInt = #line) {
+        guard let removed = remove(itemID: itemID) else {
+            specifiedItemIsNotFound(itemID, file: file, line: line)
+        }
+
+        guard let itemPosition = itemPositionMap()[afterItemID] else {
+            specifiedItemIsNotFound(afterItemID, file: file, line: line)
+        }
+
+        let itemIndex = sections[itemPosition.sectionIndex].elements.index(after: itemPosition.itemRelativeIndex)
+        sections[itemPosition.sectionIndex].elements.insert(removed, at: itemIndex)
+    }
+
+    func update(itemIDs: [ItemID], file: StaticString = #file, line: UInt = #line) {
+        let itemPositionMap = self.itemPositionMap()
+
+        for itemID in itemIDs {
+            guard let itemPosition = itemPositionMap[itemID] else {
+                specifiedItemIsNotFound(itemID, file: file, line: line)
+            }
+
+            sections[itemPosition.sectionIndex].elements[itemPosition.itemRelativeIndex].isReloaded = true
+        }
+    }
+
+    func append(sectionIDs: [SectionID]) {
+        let newSections = sectionIDs.lazy.map(Section.init)
+        sections.append(contentsOf: newSections)
+    }
+
+    func insert(sectionIDs: [SectionID], before beforeSectionID: SectionID, file: StaticString = #file, line: UInt = #line) {
+        guard let sectionIndex = sectionIndex(of: beforeSectionID) else {
+            specifiedSectionIsNotFound(beforeSectionID, file: file, line: line)
+        }
+
+        let newSections = sectionIDs.lazy.map(Section.init)
+        sections.insert(contentsOf: newSections, at: sectionIndex)
+    }
+
+    func insert(sectionIDs: [SectionID], after afterSectionID: SectionID, file: StaticString = #file, line: UInt = #line) {
+        guard let beforeIndex = sectionIndex(of: afterSectionID) else {
+            specifiedSectionIsNotFound(afterSectionID, file: file, line: line)
+        }
+
+        let sectionIndex = sections.index(after: beforeIndex)
+        let newSections = sectionIDs.lazy.map(Section.init)
+        sections.insert(contentsOf: newSections, at: sectionIndex)
+    }
+
+    func remove(sectionIDs: [SectionID]) {
+        for sectionID in sectionIDs {
+            remove(sectionID: sectionID)
+        }
+    }
+
+    func move(sectionID: SectionID, before beforeSectionID: SectionID, file: StaticString = #file, line: UInt = #line) {
+        guard let removed = remove(sectionID: sectionID) else {
+            specifiedSectionIsNotFound(sectionID, file: file, line: line)
+        }
+
+        guard let sectionIndex = sectionIndex(of: beforeSectionID) else {
+            specifiedSectionIsNotFound(beforeSectionID, file: file, line: line)
+        }
+
+        sections.insert(removed, at: sectionIndex)
+    }
+
+    func move(sectionID: SectionID, after afterSectionID: SectionID, file: StaticString = #file, line: UInt = #line) {
+        guard let removed = remove(sectionID: sectionID) else {
+            specifiedSectionIsNotFound(sectionID, file: file, line: line)
+        }
+
+        guard let beforeIndex = sectionIndex(of: afterSectionID) else {
+            specifiedSectionIsNotFound(afterSectionID, file: file, line: line)
+        }
+
+        let sectionIndex = sections.index(after: beforeIndex)
+        sections.insert(removed, at: sectionIndex)
+    }
+
+    func update(sectionIDs: [SectionID]) {
+        for sectionID in sectionIDs {
+            guard let sectionIndex = sectionIndex(of: sectionID) else {
+                continue
+            }
+
+            sections[sectionIndex].isReloaded = true
+        }
+    }
+}
+
+private extension SnapshotStructure {
+    struct ItemPosition {
+        var item: Item
+        var itemRelativeIndex: Int
+        var section: Section
+        var sectionIndex: Int
+    }
+
+    func sectionIndex(of sectionID: SectionID) -> Array<Section>.Index? {
+        return sections.firstIndex { $0.differenceIdentifier.isEqualHash(to: sectionID) }
+    }
+
+    @discardableResult
+    func remove(itemID: ItemID) -> Item? {
+        guard let itemPosition = itemPositionMap()[itemID] else {
+            return nil
+        }
+
+        return sections[itemPosition.sectionIndex].elements.remove(at: itemPosition.itemRelativeIndex)
+    }
+
+    @discardableResult
+    func remove(sectionID: SectionID) -> Section? {
+        guard let sectionIndex = sectionIndex(of: sectionID) else {
+            return nil
+        }
+
+        return sections.remove(at: sectionIndex)
+    }
+
+    func itemPositionMap() -> [ItemID: ItemPosition] {
+        return sections.enumerated().reduce(into: [:]) { result, section in
+            for (itemRelativeIndex, item) in section.element.elements.enumerated() {
+                result[item.differenceIdentifier] = ItemPosition(
+                    item: item,
+                    itemRelativeIndex: itemRelativeIndex,
+                    section: section.element,
+                    sectionIndex: section.offset
+                )
+            }
+        }
+    }
+
+    func specifiedItemIsNotFound(_ id: ItemID, file: StaticString, line: UInt) -> Never {
+        universalError("Specified item\(id) is not found.", file: file, line: line)
+    }
+
+    func specifiedSectionIsNotFound(_ id: SectionID, file: StaticString, line: UInt) -> Never {
+        universalError("Specified section\(id) is not found.", file: file, line: line)
+    }
+
+    func thereAreCurrentlyNoSections(file: StaticString, line: UInt) -> Never {
+        universalError("There are currently no sections.", file: file, line: line)
+    }
+}
@@ -0,0 +1,3 @@
+func universalError(_ message: String, file: StaticString = #file, line: UInt = #line) -> Never {
+    fatalError("[DiffableDataSources] \(message)", file: file, line: line)
+}
@@ -0,0 +1,133 @@
+#if os(iOS) || os(tvOS)
+
+import UIKit
+import DifferenceKit
+
+/// A class for backporting `UICollectionViewDiffableDataSource` introduced in iOS 13.0+, tvOS 13.0+.
+/// Represents the data model object for `UICollectionView` that can be applies the
+/// changes with automatic diffing.
+open class CollectionViewDiffableDataSource<SectionIdentifierType: Hashable, ItemIdentifierType: Hashable>: NSObject, UICollectionViewDataSource {
+    /// The type of closure providing the cell.
+    public typealias CellProvider = (UICollectionView, IndexPath, ItemIdentifierType) -> UICollectionViewCell?
+
+    /// The type of closure providing the supplementary view for element of kind.
+    public typealias SupplementaryViewProvider = (UICollectionView, String, IndexPath) -> UICollectionReusableView?
+
+    /// A closure to dequeue the views for element of kind.
+    public var supplementaryViewProvider: SupplementaryViewProvider?
+
+    private weak var collectionView: UICollectionView?
+    private let cellProvider: CellProvider
+    private let core = DiffableDataSourceCore<SectionIdentifierType, ItemIdentifierType>()
+
+    /// Creates a new data source.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance to be managed.
+    ///   - cellProvider: A closure to dequeue the cell for items.
+    public init(collectionView: UICollectionView, cellProvider: @escaping CellProvider) {
+        self.collectionView = collectionView
+        self.cellProvider = cellProvider
+        super.init()
+
+        collectionView.dataSource = self
+    }
+
+    /// Applies given snapshot to perform automatic diffing update.
+    ///
+    /// - Parameters:
+    ///   - snapshot: A snapshot object to be applied to data model.
+    ///   - animatingDifferences: A Boolean value indicating whether to update with
+    ///                           diffing animation.
+    public func apply(_ snapshot: DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>, animatingDifferences: Bool = true) {
+        core.apply(
+            snapshot,
+            view: collectionView,
+            animatingDifferences: animatingDifferences,
+            performUpdates: { collectionView, changeset, setSections in
+                collectionView.reload(using: changeset, setData: setSections)
+        })
+    }
+
+    /// Returns a new snapshot object of current state.
+    ///
+    /// - Returns: A new snapshot object of current state.
+    public func snapshot() -> DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType> {
+        return core.snapshot()
+    }
+
+    /// Returns an item identifier for given index path.
+    ///
+    /// - Parameters:
+    ///   - indexPath: An index path for the item identifier.
+    ///
+    /// - Returns: An item identifier for given index path.
+    public func itemIdentifier(for indexPath: IndexPath) -> ItemIdentifierType? {
+        return core.itemIdentifier(for: indexPath)
+    }
+
+    /// Returns an index path for given item identifier.
+    ///
+    /// - Parameters:
+    ///   - itemIdentifier: An identifier of item.
+    ///
+    /// - Returns: An index path for given item identifier.
+    public func indexPath(for itemIdentifier: ItemIdentifierType) -> IndexPath? {
+        return core.indexPath(for: itemIdentifier)
+    }
+
+    /// Returns the number of sections in the data source.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///
+    /// - Returns: The number of sections in the data source.
+    public func numberOfSections(in collectionView: UICollectionView) -> Int {
+        return core.numberOfSections()
+    }
+
+    /// Returns the number of items in the specified section.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///   - section: An index of section.
+    ///
+    /// - Returns: The number of items in the specified section.
+    public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
+        return core.numberOfItems(inSection: section)
+    }
+
+    /// Returns a cell for item at specified index path.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///   - indexPath: An index path for cell.
+    ///
+    /// - Returns: A cell for row at specified index path.
+    open func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
+        let itemIdentifier = core.unsafeItemIdentifier(for: indexPath)
+        guard let cell = cellProvider(collectionView, indexPath, itemIdentifier) else {
+            universalError("UICollectionView dataSource returned a nil cell for item at index path: \(indexPath), collectionView: \(collectionView), itemIdentifier: \(itemIdentifier)")
+        }
+
+        return cell
+    }
+
+    /// Returns a supplementary view for element of kind at specified index path.
+    ///
+    /// - Parameters:
+    ///   - collectionView: A collection view instance managed by `self`.
+    ///   - kind: The kind of element to be display.
+    ///   - indexPath: An index path for supplementary view.
+    ///
+    /// - Returns: A supplementary view for element of kind at specified index path.
+    open func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
+        guard let view = supplementaryViewProvider?(collectionView, kind, indexPath) else {
+            return UICollectionReusableView()
+        }
+
+        return view
+    }
+}
+
+#endif
@@ -0,0 +1,114 @@
+#if os(iOS) || os(tvOS)
+
+import UIKit
+import DifferenceKit
+
+/// A class for backporting `UITableViewDiffableDataSource` introduced in iOS 13.0+, tvOS 13.0+.
+/// Represents the data model object for `UITableView` that can be applies the
+/// changes with automatic diffing.
+open class TableViewDiffableDataSource<SectionIdentifierType: Hashable, ItemIdentifierType: Hashable>: NSObject, UITableViewDataSource {
+    /// The type of closure providing the cell.
+    public typealias CellProvider = (UITableView, IndexPath, ItemIdentifierType) -> UITableViewCell?
+
+    /// The default animation to updating the views.
+    public var defaultRowAnimation: UITableView.RowAnimation = .automatic
+
+    private weak var tableView: UITableView?
+    private let cellProvider: CellProvider
+    private let core = DiffableDataSourceCore<SectionIdentifierType, ItemIdentifierType>()
+
+    /// Creates a new data source.
+    ///
+    /// - Parameters:
+    ///   - tableView: A table view instance to be managed.
+    ///   - cellProvider: A closure to dequeue the cell for rows.
+    public init(tableView: UITableView, cellProvider: @escaping CellProvider) {
+        self.tableView = tableView
+        self.cellProvider = cellProvider
+        super.init()
+
+        tableView.dataSource = self
+    }
+
+    /// Applies given snapshot to perform automatic diffing update.
+    ///
+    /// - Parameters:
+    ///   - snapshot: A snapshot object to be applied to data model.
+    ///   - animatingDifferences: A Boolean value indicating whether to update with
+    ///                           diffing animation.
+    public func apply(_ snapshot: DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>, animatingDifferences: Bool = true) {
+        core.apply(
+            snapshot,
+            view: tableView,
+            animatingDifferences: animatingDifferences,
+            performUpdates: { tableView, changeset, setSections in
+                tableView.reload(using: changeset, with: self.defaultRowAnimation, setData: setSections)
+        })
+    }
+
+    /// Returns a new snapshot object of current state.
+    ///
+    /// - Returns: A new snapshot object of current state.
+    public func snapshot() -> DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType> {
+        return core.snapshot()
+    }
+
+    /// Returns an item identifier for given index path.
+    ///
+    /// - Parameters:
+    ///   - indexPath: An index path for the item identifier.
+    ///
+    /// - Returns: An item identifier for given index path.
+    public func itemIdentifier(for indexPath: IndexPath) -> ItemIdentifierType? {
+        return core.itemIdentifier(for: indexPath)
+    }
+
+    /// Returns an index path for given item identifier.
+    ///
+    /// - Parameters:
+    ///   - itemIdentifier: An identifier of item.
+    ///
+    /// - Returns: An index path for given item identifier.
+    public func indexPath(for itemIdentifier: ItemIdentifierType) -> IndexPath? {
+        return core.indexPath(for: itemIdentifier)
+    }
+
+    /// Returns the number of sections in the data source.
+    ///
+    /// - Parameters:
+    ///   - tableView: A table view instance managed by `self`.
+    ///
+    /// - Returns: The number of sections in the data source.
+    public func numberOfSections(in tableView: UITableView) -> Int {
+        return core.numberOfSections()
+    }
+
+    /// Returns the number of items in the specified section.
+    ///
+    /// - Parameters:
+    ///   - tableView: A table view instance managed by `self`.
+    ///   - section: An index of section.
+    ///
+    /// - Returns: The number of items in the specified section.
+    public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return core.numberOfItems(inSection: section)
+    }
+
+    /// Returns a cell for row at specified index path.
+    ///
+    /// - Parameters:
+    ///   - tableView: A table view instance managed by `self`.
+    ///   - indexPath: An index path for cell.
+    ///
+    /// - Returns: A cell for row at specified index path.
+    open func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let itemIdentifier = core.unsafeItemIdentifier(for: indexPath)
+        guard let cell = cellProvider(tableView, indexPath, itemIdentifier) else {
+            universalError("UITableView dataSource returned a nil cell for row at index path: \(indexPath), tableView: \(tableView), itemIdentifier: \(itemIdentifier)")
+        }
+
+        return cell
+    }
+}
+
+#endif
@@ -0,0 +1,185 @@
+#if os(macOS)
+
+import XCTest
+import AppKit
+@testable import DiffableDataSources
+
+final class CocoaCollectionViewDiffableDataSourceTests: XCTestCase {
+    func testInit() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        XCTAssertTrue(collectionView.dataSource === dataSource)
+    }
+
+    func testApply() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 0)
+
+        snapshot.appendSections([0])
+        snapshot.appendItems([0])
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 1)
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 1)
+
+        snapshot.appendItems([1])
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 2)
+    }
+
+    func testSnapshot() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        let snapshot1 = dataSource.snapshot()
+        XCTAssertEqual(snapshot1.sectionIdentifiers, [])
+        XCTAssertEqual(snapshot1.itemIdentifiers, [])
+
+        dataSource.snapshot().appendSections([0, 1, 2])
+        let snapshot2 = dataSource.snapshot()
+        XCTAssertEqual(snapshot2.sectionIdentifiers, [])
+        XCTAssertEqual(snapshot2.itemIdentifiers, [])
+
+        let snapshotToApply = DiffableDataSourceSnapshot<Int, Int>()
+        snapshotToApply.appendSections([0, 1, 2])
+        snapshotToApply.appendItems([0, 1, 2])
+        dataSource.apply(snapshotToApply)
+
+        let snapshot3 = dataSource.snapshot()
+        XCTAssertEqual(snapshot3.sectionIdentifiers, [0, 1, 2])
+        XCTAssertEqual(snapshot3.itemIdentifiers, [0, 1, 2])
+
+        dataSource.snapshot().appendSections([3, 4, 5])
+
+        let snapshot4 = dataSource.snapshot()
+        XCTAssertEqual(snapshot4.sectionIdentifiers, [0, 1, 2])
+        XCTAssertEqual(snapshot4.itemIdentifiers, [0, 1, 2])
+
+        snapshot4.appendSections([3, 4, 5])
+        snapshot4.appendItems([3, 4, 5])
+        dataSource.apply(snapshot4)
+
+        let snapshot5 = dataSource.snapshot()
+        XCTAssertEqual(snapshot5.sectionIdentifiers, [0, 1, 2, 3, 4, 5])
+        XCTAssertEqual(snapshot5.itemIdentifiers, [0, 1, 2, 3, 4, 5])
+    }
+
+    func testItemIdentifier() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.itemIdentifier(for: IndexPath(item: 1, section: 0)), 1)
+        XCTAssertEqual(dataSource.itemIdentifier(for: IndexPath(item: 100, section: 100)), nil)
+    }
+
+    func testIndexPath() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.indexPath(for: 2), IndexPath(item: 2, section: 0))
+        XCTAssertEqual(dataSource.indexPath(for: 100), nil)
+    }
+
+    func testNumberOfSections() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        XCTAssertEqual(dataSource.numberOfSections(in: collectionView), 0)
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.numberOfSections(in: collectionView), 3)
+    }
+
+    func testNumberOfRowsInSection() {
+        let collectionView = MockCollectionView()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            NSCollectionViewItem()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.collectionView(collectionView, numberOfItemsInSection: 0), 3)
+    }
+
+    func testCellForRowAt() {
+        let collectionView = MockCollectionView()
+        let item = NSCollectionViewItem()
+        let dataSource = CocoaCollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            item
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(
+            dataSource.collectionView(collectionView, itemForRepresentedObjectAt: IndexPath(item: 1, section: 0)),
+            item
+        )
+    }
+}
+
+final class MockCollectionView: NSCollectionView {
+    var isPerformBatchUpdatesCalledCount = 0
+
+    init() {
+        super.init(frame: .zero)
+
+        let window = NSWindow()
+        window.contentView = self
+    }
+
+    @available(*, unavailable)
+    required init?(coder decoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func performBatchUpdates(_ updates: (() -> Void)?, completionHandler: ((Bool) -> Void)? = nil) {
+        isPerformBatchUpdatesCalledCount += 1
+        updates?()
+        completionHandler?(true)
+    }
+
+    override func insertItems(at indexPaths: Set<IndexPath>) {}
+}
+
+#endif
@@ -0,0 +1,186 @@
+#if os(iOS) || os(tvOS)
+
+import XCTest
+import UIKit
+@testable import DiffableDataSources
+
+final class CollectionViewDiffableDataSourceTests: XCTestCase {
+    func testInit() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        XCTAssertTrue(collectionView.dataSource === dataSource)
+    }
+
+    func testApply() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 0)
+
+        snapshot.appendSections([0])
+        snapshot.appendItems([0])
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 1)
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 1)
+
+        snapshot.appendItems([1])
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(collectionView.isPerformBatchUpdatesCalledCount, 2)
+    }
+
+    func testSnapshot() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        let snapshot1 = dataSource.snapshot()
+        XCTAssertEqual(snapshot1.sectionIdentifiers, [])
+        XCTAssertEqual(snapshot1.itemIdentifiers, [])
+
+        dataSource.snapshot().appendSections([0, 1, 2])
+        let snapshot2 = dataSource.snapshot()
+        XCTAssertEqual(snapshot2.sectionIdentifiers, [])
+        XCTAssertEqual(snapshot2.itemIdentifiers, [])
+
+        let snapshotToApply = DiffableDataSourceSnapshot<Int, Int>()
+        snapshotToApply.appendSections([0, 1, 2])
+        snapshotToApply.appendItems([0, 1, 2])
+        dataSource.apply(snapshotToApply)
+
+        let snapshot3 = dataSource.snapshot()
+        XCTAssertEqual(snapshot3.sectionIdentifiers, [0, 1, 2])
+        XCTAssertEqual(snapshot3.itemIdentifiers, [0, 1, 2])
+
+        dataSource.snapshot().appendSections([3, 4, 5])
+
+        let snapshot4 = dataSource.snapshot()
+        XCTAssertEqual(snapshot4.sectionIdentifiers, [0, 1, 2])
+        XCTAssertEqual(snapshot4.itemIdentifiers, [0, 1, 2])
+
+        snapshot4.appendSections([3, 4, 5])
+        snapshot4.appendItems([3, 4, 5])
+        dataSource.apply(snapshot4)
+
+        let snapshot5 = dataSource.snapshot()
+        XCTAssertEqual(snapshot5.sectionIdentifiers, [0, 1, 2, 3, 4, 5])
+        XCTAssertEqual(snapshot5.itemIdentifiers, [0, 1, 2, 3, 4, 5])
+    }
+
+    func testItemIdentifier() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.itemIdentifier(for: IndexPath(item: 1, section: 0)), 1)
+        XCTAssertEqual(dataSource.itemIdentifier(for: IndexPath(item: 100, section: 100)), nil)
+    }
+
+    func testIndexPath() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.indexPath(for: 2), IndexPath(item: 2, section: 0))
+        XCTAssertEqual(dataSource.indexPath(for: 100), nil)
+    }
+
+    func testNumberOfSections() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        XCTAssertEqual(dataSource.numberOfSections(in: collectionView), 0)
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.numberOfSections(in: collectionView), 3)
+    }
+
+    func testNumberOfRowsInSection() {
+        let collectionView = MockCollectionView()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            UICollectionViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.collectionView(collectionView, numberOfItemsInSection: 0), 3)
+    }
+
+    func testCellForRowAt() {
+        let collectionView = MockCollectionView()
+        let cell = UICollectionViewCell()
+        let dataSource = CollectionViewDiffableDataSource<Int, Int>(collectionView: collectionView) { _, _, _ in
+            cell
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(
+            dataSource.collectionView(collectionView, cellForItemAt: IndexPath(item: 1, section: 0)),
+            cell
+        )
+    }
+}
+
+final class MockCollectionView: UICollectionView {
+    var isPerformBatchUpdatesCalledCount = 0
+
+    init() {
+        super.init(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
+
+        let window = UIWindow()
+        window.addSubview(self)
+    }
+
+    @available(*, unavailable)
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func performBatchUpdates(_ updates: (() -> Void)?, completion: ((Bool) -> Void)? = nil) {
+        isPerformBatchUpdatesCalledCount += 1
+        updates?()
+        completion?(true)
+    }
+
+    override func insertSections(_ sections: IndexSet) {}
+    override func insertItems(at indexPaths: [IndexPath]) {}
+}
+
+#endif
@@ -0,0 +1,895 @@
+import XCTest
+@testable import DiffableDataSources
+
+// swiftlint:disable file_length
+// swiftlint:disable type_body_length
+
+final class DiffableDataSourceSnapshotTests: XCTestCase {
+    func testAppendSections() {
+        typealias Test = (initial: [Int], append: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [], [0, 1]),
+            ([], [0, 1, 2], [0, 1, 2]),
+            ([0, 1], [2, 3, 4], [0, 1, 2, 3, 4]),
+            ([0, 1], [4, 3, 2], [0, 1, 4, 3, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.appendSections(test.append)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testAppendSectionsDuplication() {
+        typealias Test = (initial: [Int], append: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [0], [0, 1, 0]),
+            ([0, 1], [0, 1], [0, 1, 0, 1]),
+            ([0, 1], [2, 2], [0, 1, 2, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.appendSections(test.append)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testInsertSectionsBeforeSection() {
+        typealias Test = (initial: [Int], insert: [Int], before: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [3, 4], 1, [0, 3, 4, 1]),
+            ([0, 1], [3, 4], 0, [3, 4, 0, 1]),
+            ([0, 1, 2], [3, 4], 2, [0, 1, 3, 4, 2]),
+            ([0, 1, 2], [], 2, [0, 1, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.insertSections(test.insert, beforeSection: test.before)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testInsertSectionsBeforeSectionDuplication() {
+        typealias Test = (initial: [Int], insert: [Int], before: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [1], 0, [1, 0, 1]),
+            ([0, 1], [2, 2], 1, [0, 2, 2, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.insertSections(test.insert, beforeSection: test.before)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testInsertSectionsAfterSection() {
+        typealias Test = (initial: [Int], insert: [Int], after: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [3, 4], 1, [0, 1, 3, 4]),
+            ([0, 1], [3, 4], 0, [0, 3, 4, 1]),
+            ([0, 1, 2], [3, 4], 2, [0, 1, 2, 3, 4]),
+            ([0, 1, 2], [], 2, [0, 1, 2]),
+            ([0], [1], 0, [0, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.insertSections(test.insert, afterSection: test.after)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testInsertSectionsAfterSectionDuplication() {
+        typealias Test = (initial: [Int], insert: [Int], after: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [1], 0, [0, 1, 1]),
+            ([0, 1], [2, 2], 1, [0, 1, 2, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.insertSections(test.insert, afterSection: test.after)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testDeleteSections() {
+        typealias Test = (initial: [Int], delete: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [1], [0]),
+            ([0, 1], [0], [1]),
+            ([0, 1, 2], [1], [0, 2]),
+            ([0, 1], [1], [0]),
+            ([], [1], []),
+            ([0, 1], [100], [0, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.deleteSections(test.delete)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testMoveSectionBeforeSection() {
+        typealias Test = (initial: [Int], move: Int, before: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], 1, 0, [1, 0]),
+            ([0, 1, 2], 2, 0, [2, 0, 1]),
+            ([0, 1, 2], 0, 2, [1, 0, 2]),
+            ([0, 1, 2], 1, 2, [0, 1, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.moveSection(test.move, beforeSection: test.before)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testMoveSectionAfterSection() {
+        typealias Test = (initial: [Int], move: Int, after: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], 0, 1, [1, 0]),
+            ([0, 1, 2], 2, 0, [0, 2, 1]),
+            ([0, 1, 2], 0, 2, [1, 2, 0]),
+            ([0, 1, 2], 1, 0, [0, 1, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.moveSection(test.move, afterSection: test.after)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testReloadSections() {
+        typealias Section = SnapshotStructure<Int, Int>.Section
+        typealias Test = (initial: [Int], reload: [Int], sections: [Section])
+
+        let tests: [Test] = [
+            ([], [], []),
+            ([0], [1], [
+                Section(id: 0, items: [], isReloaded: false)
+                ]
+            ),
+            ([0], [0], [
+                Section(id: 0, items: [], isReloaded: true)
+                ]
+            ),
+            ([0, 1, 2], [2], [
+                Section(id: 0, items: [], isReloaded: false),
+                Section(id: 1, items: [], isReloaded: false),
+                Section(id: 2, items: [], isReloaded: true)
+                ]
+            ),
+            ([2, 1, 0], [0, 1], [
+                Section(id: 2, items: [], isReloaded: false),
+                Section(id: 1, items: [], isReloaded: true),
+                Section(id: 0, items: [], isReloaded: true)
+                ]
+            )
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+            snapshot.reloadSections(test.reload)
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.initial)
+
+            XCTAssertEqual(snapshot.structure.sections, test.sections)
+        }
+    }
+
+    func testAppendItems() {
+        typealias Test = (initial: [Int], append: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [2, 3], [0, 1, 2, 3]),
+            ([], [2, 3], [2, 3]),
+            ([1], [0], [1, 0])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections([0, 1])
+            snapshot.appendItems(test.initial)
+            snapshot.appendItems(test.append)
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expected)
+        }
+    }
+
+    func testAppendItemsDuplication() {
+        typealias Test = (initial: [Int], append: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([1], [1, 2], [1, 1, 2]),
+            ([1], [2, 2], [1, 2, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections([0, 1])
+            snapshot.appendItems(test.initial)
+            snapshot.appendItems(test.append)
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expected)
+        }
+    }
+
+    func testAppendItemsToSection() {
+        typealias Test = (initial: [[Int]], append: [Int], section: Int, expected: [[Int]])
+
+        let tests: [Test] = [
+            ([[], [0, 1]], [2, 3], 1, [[], [0, 1, 2, 3]]),
+            ([[], []], [2, 3], 1, [[], [2, 3]]),
+            ([[], [1]], [0], 1, [[], [1, 0]]),
+            ([[], [1]], [2], 0, [[2], [1]]),
+            ([[], [1]], [2, 3], 0, [[2, 3], [1]]),
+            ([[], []], [0], 0, [[0], []])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items)
+            }
+
+            snapshot.appendItems(test.append, toSection: test.section)
+
+            for (section, items) in test.expected.enumerated() {
+                XCTAssertEqual(snapshot.itemIdentifiers(inSection: section), items)
+            }
+        }
+    }
+
+    func testAppendItemsToSectionDuplication() {
+        typealias Test = (initial: [[Int]], append: [Int], section: Int, expected: [[Int]])
+
+        let tests: [Test] = [
+            ([[], [1]], [1, 2], 1, [[], [1, 1, 2]]),
+            ([[], [1]], [2, 2], 1, [[], [1, 2, 2]])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items)
+            }
+
+            snapshot.appendItems(test.append, toSection: test.section)
+
+            for (section, items) in test.expected.enumerated() {
+                XCTAssertEqual(snapshot.itemIdentifiers(inSection: section), items)
+            }
+        }
+    }
+
+    func testInsertItemsBeforeItem() {
+        typealias Test = (initial: [Int], insert: [Int], before: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [2, 3], 1, [0, 2, 3, 1]),
+            ([0, 1], [2, 3], 0, [2, 3, 0, 1]),
+            ([0, 1, 2], [3, 4], 1, [0, 3, 4, 1, 2]),
+            ([0, 1, 2], [], 1, [0, 1, 2]),
+            ([0], [1], 0, [1, 0])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections([0, 1])
+            snapshot.appendItems(test.initial)
+            snapshot.insertItems(test.insert, beforeItem: test.before)
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expected)
+        }
+    }
+
+    func testInsertItemsBeforeItemDuplication() {
+        typealias Test = (initial: [Int], insert: [Int], before: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([1], [1, 2], 1, [1, 2, 1]),
+            ([1], [2, 2], 1, [2, 2, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections([0, 1])
+            snapshot.appendItems(test.initial)
+            snapshot.insertItems(test.insert, beforeItem: test.before)
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expected)
+        }
+    }
+
+    func testInsertItemsAfterItem() {
+        typealias Test = (initial: [Int], insert: [Int], after: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 1], [2, 3], 1, [0, 1, 2, 3]),
+            ([0, 1], [2, 3], 0, [0, 2, 3, 1]),
+            ([0, 1, 2], [3, 4], 1, [0, 1, 3, 4, 2]),
+            ([0, 1, 2], [], 1, [0, 1, 2]),
+            ([0], [1], 0, [0, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections([0, 1])
+            snapshot.appendItems(test.initial)
+            snapshot.insertItems(test.insert, afterItem: test.after)
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expected)
+        }
+    }
+
+    func testInsertItemsAfterItemDuplication() {
+        typealias Test = (initial: [Int], insert: [Int], after: Int, expected: [Int])
+
+        let tests: [Test] = [
+            ([1], [1, 2], 1, [1, 1, 2]),
+            ([1], [2, 2], 1, [1, 2, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections([0, 1])
+            snapshot.appendItems(test.initial)
+            snapshot.insertItems(test.insert, afterItem: test.after)
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expected)
+        }
+    }
+
+    func testDeleteItems() {
+        typealias Test = (initial: [[Int]], delete: [Int], expected: [[Int]])
+
+        let tests: [Test] = [
+            ([[], [0, 1]], [0], [[], [1]]),
+            ([[0, 1], [2, 3]], [0, 2], [[1], [3]]),
+            ([[], []], [100], [[], []]),
+            ([[0, 1], [2, 3]], [0, 1], [[], [2, 3]]),
+            ([[0, 1], [2, 3]], [0], [[1], [2, 3]]),
+            ([[0, 1], [2, 3]], [0, 1, 2, 3], [[], []]),
+            ([[0, 1], [2, 3]], [0, 1, 2, 3, 4, 5], [[], []])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            snapshot.deleteItems(test.delete)
+
+            for (section, items) in test.expected.enumerated() {
+                XCTAssertEqual(snapshot.itemIdentifiers(inSection: section), items)
+            }
+        }
+    }
+
+    func testDeleteAllItems() {
+        typealias Test = [[Int]]
+
+        let tests: [Test] = [
+            ([[], [0, 1]]),
+            ([[0], [1]]),
+            ([[], []]),
+            ([[0, 1], [2, 3]]),
+            ([[0, 1, 2], []]),
+            ([[], [0, 1, 2]])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            snapshot.deleteAllItems()
+
+            XCTAssertEqual(snapshot.itemIdentifiers, [])
+        }
+    }
+
+    func testMoveItemsBeforeItem() {
+        typealias Test = (initial: [[Int]], move: Int, before: Int, expected: [[Int]])
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], 0, 2, [[1], [0, 2, 3]]),
+            ([[0, 1], [2, 3]], 1, 0, [[1, 0], [2, 3]]),
+            ([[0, 1], [2, 3]], 3, 0, [[3, 0, 1], [2]]),
+            ([[0, 1], [2, 3]], 2, 3, [[0, 1], [2, 3]]),
+            ([[0], [1]], 0, 1, [[], [0, 1]]),
+            ([[0], [1]], 1, 0, [[1, 0], []]),
+            ([[], [0, 1]], 1, 0, [[], [1, 0]])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            snapshot.moveItem(test.move, beforeItem: test.before)
+
+            for (section, items) in test.expected.enumerated() {
+                XCTAssertEqual(snapshot.itemIdentifiers(inSection: section), items)
+            }
+        }
+    }
+
+    func testMoveItemsAfterItem() {
+        typealias Test = (initial: [[Int]], move: Int, after: Int, expected: [[Int]])
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], 0, 2, [[1], [2, 0, 3]]),
+            ([[0, 1], [2, 3]], 1, 0, [[0, 1], [2, 3]]),
+            ([[0, 1], [2, 3]], 3, 0, [[0, 3, 1], [2]]),
+            ([[0, 1], [2, 3]], 2, 3, [[0, 1], [3, 2]]),
+            ([[0], [1]], 0, 1, [[], [1, 0]]),
+            ([[0], [1]], 1, 0, [[0, 1], []]),
+            ([[], [0, 1]], 1, 0, [[], [0, 1]])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            snapshot.moveItem(test.move, afterItem: test.after)
+
+            for (section, items) in test.expected.enumerated() {
+                XCTAssertEqual(snapshot.itemIdentifiers(inSection: section), items)
+            }
+        }
+    }
+
+    func testReloadItems() {
+        typealias Section = SnapshotStructure<Int, Int>.Section
+        typealias Item = SnapshotStructure<Int, Int>.Item
+        typealias Test = (initial: [[Int]], reload: [Int], sections: [Section])
+
+        let tests: [Test] = [
+            ([[], []], [], [
+                Section(id: 0, items: [], isReloaded: false),
+                Section(id: 1, items: [], isReloaded: false)
+                ]
+            ),
+            ([[], [0]], [0], [
+                Section(id: 0, items: [], isReloaded: false),
+                Section(
+                    id: 1,
+                    items: [
+                        Item(id: 0, isReloaded: true)
+                    ],
+                    isReloaded: false
+                )
+                ]
+            ),
+            ([[0, 1], [2]], [1, 2], [
+                Section(
+                    id: 0,
+                    items: [
+                        Item(id: 0, isReloaded: false),
+                        Item(id: 1, isReloaded: true)
+                    ],
+                    isReloaded: false
+                ),
+                Section(
+                    id: 1,
+                    items: [
+                        Item(id: 2, isReloaded: true)
+                    ],
+                    isReloaded: false
+                )
+                ]
+            ),
+            ([[0, 1], [2, 3]], [0, 2, 3], [
+                Section(
+                    id: 0,
+                    items: [
+                        Item(id: 0, isReloaded: true),
+                        Item(id: 1, isReloaded: false)
+                    ],
+                    isReloaded: false
+                ),
+                Section(
+                    id: 1,
+                    items: [
+                        Item(id: 2, isReloaded: true),
+                        Item(id: 3, isReloaded: true)
+                    ],
+                    isReloaded: false
+                )
+                ]
+            )
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            snapshot.reloadItems(test.reload)
+
+            XCTAssertEqual(snapshot.itemIdentifiers, test.initial.flatMap { $0 })
+
+            XCTAssertEqual(snapshot.structure.sections, test.sections)
+        }
+    }
+
+    func testNumberOfItems() {
+        typealias Test = (initial: [[Int]], expected: Int)
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], 4),
+            ([[0, 1], []], 2),
+            ([[], [2, 3]], 2),
+            ([[], []], 0)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.numberOfItems, test.expected)
+        }
+    }
+
+    func testNumberOfItemsDuplication() {
+        typealias Test = (initial: [[Int]], expected: Int)
+
+        let tests: [Test] = [
+            ([[0, 1], [1, 2]], 4),
+            ([[0, 0], []], 2)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.numberOfItems, test.expected)
+        }
+    }
+
+    func testNumberOfSections() {
+        typealias Test = (initial: [Int], expected: Int)
+
+        let tests: [Test] = [
+            ([], 0),
+            ([0, 1, 2], 3)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+
+            XCTAssertEqual(snapshot.numberOfSections, test.expected)
+        }
+    }
+
+    func testNumberOfSectionsDuplication() {
+        typealias Test = (initial: [Int], expected: Int)
+
+        let tests: [Test] = [
+            ([0, 0], 2),
+            ([0, 1, 1], 3)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+
+            XCTAssertEqual(snapshot.numberOfSections, test.expected)
+        }
+    }
+
+    func testItemIdentifiers() {
+        typealias Test = (initial: [[Int]], expected: [Int])
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], [0, 1, 2, 3]),
+            ([[0, 1], []], [0, 1]),
+            ([[], [2, 3]], [2, 3]),
+            ([[], []], [])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.itemIdentifiers, test.expected)
+        }
+    }
+
+    func testItemIdentifiersDuplication() {
+        typealias Test = (initial: [[Int]], expected: [Int])
+
+        let tests: [Test] = [
+            ([[0, 1], [1, 2]], [0, 1, 1, 2]),
+            ([[0, 0], [1, 2]], [0, 0, 1, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.itemIdentifiers, test.expected)
+        }
+    }
+
+    func testSectionIdentifiers() {
+        typealias Test = (initial: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([], []),
+            ([0, 1], [0, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testSectionIdentifiersDuplication() {
+        typealias Test = (initial: [Int], expected: [Int])
+
+        let tests: [Test] = [
+            ([0, 0], [0, 0]),
+            ([0, 1, 1], [0, 1, 1])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+
+            XCTAssertEqual(snapshot.sectionIdentifiers, test.expected)
+        }
+    }
+
+    func testNumberOfItemsInSection() {
+        typealias Test = (initial: [[Int]], expectedInRight: Int)
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], 2),
+            ([[0, 1], []], 0),
+            ([[], [2, 3]], 2),
+            ([[], []], 0)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.numberOfItems(inSection: 1), test.expectedInRight)
+        }
+    }
+
+    func testNumberOfItemsInSectionDuplication() {
+        typealias Test = (initial: [[Int]], expectedInRight: Int)
+
+        let tests: [Test] = [
+            ([[0], [1, 1]], 2),
+            ([[0, 1], [1, 2]], 2)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.numberOfItems(inSection: 1), test.expectedInRight)
+        }
+    }
+
+    func testItemIdentifiersInSection() {
+        typealias Test = (initial: [[Int]], expectedInRight: [Int])
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], [2, 3]),
+            ([[0, 1], []], []),
+            ([[], [2, 3]], [2, 3]),
+            ([[], []], [])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expectedInRight)
+        }
+    }
+
+    func testItemIdentifiersInSectionDuplication() {
+        typealias Test = (initial: [[Int]], expectedInRight: [Int])
+
+        let tests: [Test] = [
+            ([[0, 1], [1, 2]], [1, 2]),
+            ([[0, 1], [2, 2]], [2, 2])
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.itemIdentifiers(inSection: 1), test.expectedInRight)
+        }
+    }
+
+    func testSectionIdentifiersContainingItem() {
+        typealias Test = (initial: [[Int]], item: Int, expected: Int?)
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], 2, 1),
+            ([[0, 1], []], 0, 0),
+            ([[], [2, 3]], 2, 1),
+            ([[], []], 0, nil),
+            ([[0], [1]], 2, nil)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.sectionIdentifier(containingItem: test.item), test.expected)
+        }
+    }
+
+    func testSectionIdentifiersContainingDulication() {
+        typealias Test = (initial: [[Int]], item: Int, expected: Int?)
+
+        let tests: [Test] = [
+            ([[0, 1], [1, 2]], 2, 1),
+            ([[0, 1], [1, 2]], 1, 1)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.sectionIdentifier(containingItem: test.item), test.expected)
+        }
+    }
+
+    func testIndexOfItem() {
+        typealias Test = (initial: [[Int]], item: Int, expectedIndex: Int?)
+
+        let tests: [Test] = [
+            ([[0, 1], [2, 3]], 2, 2),
+            ([[0, 1], []], 0, 0),
+            ([[], [2, 3]], 2, 0),
+            ([[], []], 0, nil),
+            ([[0], [1]], 2, nil)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.indexOfItem(test.item), test.expectedIndex)
+        }
+    }
+
+    func testIndexOfItemDuplication() {
+        typealias Test = (initial: [[Int]], item: Int, expectedIndex: Int?)
+
+        let tests: [Test] = [
+            ([[0, 1], [1, 2]], 2, 3),
+            ([[0, 1], [1, 2]], 1, 1)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            for (section, items) in test.initial.enumerated() {
+                snapshot.appendSections([section])
+                snapshot.appendItems(items, toSection: section)
+            }
+
+            XCTAssertEqual(snapshot.indexOfItem(test.item), test.expectedIndex)
+        }
+    }
+
+    func testIndexOfSection() {
+        typealias Test = (initial: [Int], section: Int, expectedIndex: Int?)
+
+        let tests: [Test] = [
+            ([0, 1, 2], 1, 1),
+            ([0, 1, 2], 2, 2),
+            ([0, 1, 2], 3, nil),
+            ([], 0, nil)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+
+            XCTAssertEqual(snapshot.indexOfSection(test.section), test.expectedIndex)
+        }
+    }
+
+    func testIndexOfSectionDuplication() {
+        typealias Test = (initial: [Int], section: Int, expectedIndex: Int?)
+
+        let tests: [Test] = [
+            ([0, 1, 1, 2], 1, 1),
+            ([0, 1, 1, 2], 2, 3)
+        ]
+
+        for test in tests {
+            let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+            snapshot.appendSections(test.initial)
+
+            XCTAssertEqual(snapshot.indexOfSection(test.section), test.expectedIndex)
+        }
+    }
+}
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
@@ -0,0 +1,58 @@
+import XCTest
+@testable import DiffableDataSources
+
+final class MainThreadSerialDispatcherTests: XCTestCase {
+    func testMainThread() {
+        let dispatcher = MainThreadSerialDispatcher()
+        let queue = DispatchQueue.global()
+        let expectation = self.expectation(description: "testMainThread")
+
+        queue.async {
+            dispatcher.dispatch {
+                XCTAssertTrue(Thread.isMainThread)
+                expectation.fulfill()
+            }
+        }
+
+        waitForExpectations(timeout: 1)
+    }
+
+    func testMainThreadSerial() {
+        let dispatcher = MainThreadSerialDispatcher()
+        let queue = DispatchQueue.global()
+        let expectation = self.expectation(description: "testMainThreadSerial")
+
+        var array = [Int]()
+
+        let group = DispatchGroup()
+
+        queue.async(group: group) {
+            dispatcher.dispatch {
+                array.append(0)
+            }
+        }
+
+        group.wait()
+
+        queue.async(group: group) {
+            dispatcher.dispatch {
+                array.append(1)
+            }
+
+            dispatcher.dispatch {
+                array.append(2)
+            }
+        }
+
+        group.wait()
+
+        dispatcher.dispatch {
+            array.append(3)
+            expectation.fulfill()
+        }
+
+        waitForExpectations(timeout: 1) { _ in
+            XCTAssertEqual(array, [0, 1, 2, 3])
+        }
+    }
+}
@@ -0,0 +1,186 @@
+#if os(iOS) || os(tvOS)
+
+import XCTest
+import UIKit
+@testable import DiffableDataSources
+
+final class TableViewDiffableDataSourceTests: XCTestCase {
+    func testInit() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        XCTAssertTrue(tableView.dataSource === dataSource)
+    }
+
+    func testApply() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(tableView.isPerformBatchUpdatesCalledCount, 0)
+
+        snapshot.appendSections([0])
+        snapshot.appendItems([0])
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(tableView.isPerformBatchUpdatesCalledCount, 1)
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(tableView.isPerformBatchUpdatesCalledCount, 1)
+
+        snapshot.appendItems([1])
+
+        dataSource.apply(snapshot)
+        XCTAssertEqual(tableView.isPerformBatchUpdatesCalledCount, 2)
+    }
+
+    func testSnapshot() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        let snapshot1 = dataSource.snapshot()
+        XCTAssertEqual(snapshot1.sectionIdentifiers, [])
+        XCTAssertEqual(snapshot1.itemIdentifiers, [])
+
+        dataSource.snapshot().appendSections([0, 1, 2])
+        let snapshot2 = dataSource.snapshot()
+        XCTAssertEqual(snapshot2.sectionIdentifiers, [])
+        XCTAssertEqual(snapshot2.itemIdentifiers, [])
+
+        let snapshotToApply = DiffableDataSourceSnapshot<Int, Int>()
+        snapshotToApply.appendSections([0, 1, 2])
+        snapshotToApply.appendItems([0, 1, 2])
+        dataSource.apply(snapshotToApply)
+
+        let snapshot3 = dataSource.snapshot()
+        XCTAssertEqual(snapshot3.sectionIdentifiers, [0, 1, 2])
+        XCTAssertEqual(snapshot3.itemIdentifiers, [0, 1, 2])
+
+        dataSource.snapshot().appendSections([3, 4, 5])
+
+        let snapshot4 = dataSource.snapshot()
+        XCTAssertEqual(snapshot4.sectionIdentifiers, [0, 1, 2])
+        XCTAssertEqual(snapshot4.itemIdentifiers, [0, 1, 2])
+
+        snapshot4.appendSections([3, 4, 5])
+        snapshot4.appendItems([3, 4, 5])
+        dataSource.apply(snapshot4)
+
+        let snapshot5 = dataSource.snapshot()
+        XCTAssertEqual(snapshot5.sectionIdentifiers, [0, 1, 2, 3, 4, 5])
+        XCTAssertEqual(snapshot5.itemIdentifiers, [0, 1, 2, 3, 4, 5])
+    }
+
+    func testItemIdentifier() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.itemIdentifier(for: IndexPath(item: 1, section: 0)), 1)
+        XCTAssertEqual(dataSource.itemIdentifier(for: IndexPath(item: 100, section: 100)), nil)
+    }
+
+    func testIndexPath() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.indexPath(for: 2), IndexPath(item: 2, section: 0))
+        XCTAssertEqual(dataSource.indexPath(for: 100), nil)
+    }
+
+    func testNumberOfSections() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        XCTAssertEqual(dataSource.numberOfSections(in: tableView), 0)
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.numberOfSections(in: tableView), 3)
+    }
+
+    func testNumberOfRowsInSection() {
+        let tableView = MockTableView()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            UITableViewCell()
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(dataSource.tableView(tableView, numberOfRowsInSection: 0), 3)
+    }
+
+    func testCellForRowAt() {
+        let tableView = MockTableView()
+        let cell = UITableViewCell()
+        let dataSource = TableViewDiffableDataSource<Int, Int>(tableView: tableView) { _, _, _ in
+            cell
+        }
+
+        let snapshot = DiffableDataSourceSnapshot<Int, Int>()
+        snapshot.appendSections([0, 1, 2])
+        snapshot.appendItems([0, 1, 2], toSection: 0)
+        dataSource.apply(snapshot)
+
+        XCTAssertEqual(
+            dataSource.tableView(tableView, cellForRowAt: IndexPath(item: 1, section: 0)),
+            cell
+        )
+    }
+}
+
+final class MockTableView: UITableView {
+    var isPerformBatchUpdatesCalledCount = 0
+
+    init() {
+        super.init(frame: .zero, style: .plain)
+
+        let window = UIWindow()
+        window.addSubview(self)
+    }
+
+    @available(*, unavailable)
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func performBatchUpdates(_ updates: (() -> Void)?, completion: ((Bool) -> Void)? = nil) {
+        isPerformBatchUpdatesCalledCount += 1
+        updates?()
+        completion?(true)
+    }
+
+    override func insertSections(_ sections: IndexSet, with animation: RowAnimation) {}
+    override func insertRows(at indexPaths: [IndexPath], with animation: RowAnimation) {}
+}
+
+#endif
@@ -0,0 +1,22 @@
+MACOSX_DEPLOYMENT_TARGET = 10.11
+IPHONEOS_DEPLOYMENT_TARGET = 9.0
+TVOS_DEPLOYMENT_TARGET = 9.0
+
+SDKROOT = 
+SUPPORTED_PLATFORMS = macosx iphoneos iphonesimulator appletvos appletvsimulator
+TARGETED_DEVICE_FAMILY = 1,2,3
+VALID_ARCHS[sdk=macosx*] = i386 x86_64
+VALID_ARCHS[sdk=iphoneos*] = arm64 armv7 armv7s
+VALID_ARCHS[sdk=iphonesimulator*] = i386 x86_64
+VALID_ARCHS[sdk=appletv*] = arm64
+VALID_ARCHS[sdk=appletvsimulator*] = x86_64
+
+CODE_SIGN_IDENTITY =
+CODE_SIGN_STYLE = Manual
+INSTALL_PATH = $(LOCAL_LIBRARY_DIR)/Frameworks
+SKIP_INSTALL = YES
+DYLIB_COMPATIBILITY_VERSION = 1
+DYLIB_CURRENT_VERSION = 1
+DYLIB_INSTALL_NAME_BASE = @rpath
+LD_RUNPATH_SEARCH_PATHS = $(inherited) @executable_path/../Frameworks @loader_path/Frameworks @loader_path/../Frameworks
+DEFINES_MODULE = NO
@@ -0,0 +1,41 @@
+trigger:
+- master
+
+jobs:
+- job: macOS
+  pool:
+    vmImage: 'macOS 10.14'
+  strategy:
+    maxParallel: 10
+    matrix:
+      xcode10_2:
+        DEVELOPER_DIR: /Applications/Xcode_10.2.app
+  steps:
+    - checkout: self
+      submodules: true
+    - script: xcodebuild -version
+      displayName: xcodebuild -version
+      condition: succeededOrFailed()
+    - script: |
+       set -o pipefail &&
+       xcodebuild build-for-testing test-without-building -workspace DiffableDataSources.xcworkspace -scheme DiffableDataSources -configuration Release ENABLE_TESTABILITY=YES |
+       xcpretty -c -r junit -o build/reports/xcodebuild-macOS.xml
+      displayName: xcodebuild test maxOS
+      condition: succeededOrFailed()
+    - script: |
+        set -o pipefail &&
+        xcodebuild build-for-testing test-without-building -workspace DiffableDataSources.xcworkspace -scheme DiffableDataSources -configuration Release -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone Xs' ENABLE_TESTABILITY=YES |
+        xcpretty -c -r junit -o build/reports/xcodebuild-iOS.xml
+      displayName: xcodebuild test iOS
+      condition: succeededOrFailed()
+    - script: |
+        set -o pipefail &&
+        xcodebuild build-for-testing test-without-building -workspace DiffableDataSources.xcworkspace -scheme DiffableDataSources -configuration Release -sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV' ENABLE_TESTABILITY=YES |
+        xcpretty -c -r junit -o build/reports/xcodebuild-tvOS.xml
+      displayName: xcodebuild test tvOS
+      condition: succeededOrFailed()
+    - task: PublishTestResults@2
+      inputs:
+        testRunner: JUnit
+        testResultsFiles: build/reports/**
+      condition: succeededOrFailed()
@@ -0,0 +1,686 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>CollectionViewDiffableDataSource Class Reference</title>
+    <link rel="stylesheet" type="text/css" href="../css/jazzy.css" />
+    <link rel="stylesheet" type="text/css" href="../css/highlight.css" />
+    <meta charset="utf-8">
+    <script src="../js/jquery.min.js" defer></script>
+    <script src="../js/jazzy.js" defer></script>
+    
+    <script src="../js/lunr.min.js" defer></script>
+    <script src="../js/typeahead.jquery.js" defer></script>
+    <script src="../js/jazzy.search.js" defer></script>
+  </head>
+  <body>
+
+    <a name="//apple_ref/swift/Class/CollectionViewDiffableDataSource" class="dashAnchor"></a>
+
+    <a title="CollectionViewDiffableDataSource Class Reference"></a>
+
+    <header class="header">
+      <p class="header-col header-col--primary">
+        <a class="header-link" href="../index.html">
+          DiffableDataSources Docs
+        </a>
+         (100% documented)
+      </p>
+    
+      <p class="header-col--secondary">
+        <form role="search" action="../search.json">
+          <input type="text" placeholder="Search documentation" data-typeahead>
+        </form>
+      </p>
+    
+        <p class="header-col header-col--secondary">
+          <a class="header-link" href="https://github.com/ra1028/DiffableDataSources">
+            <img class="header-icon" src="../img/gh.png"/>
+            View on GitHub
+          </a>
+        </p>
+    
+    </header>
+
+    <p class="breadcrumbs">
+      <a class="breadcrumb" href="../index.html">DiffableDataSources Reference</a>
+      <img class="carat" src="../img/carat.png" />
+      CollectionViewDiffableDataSource Class Reference
+    </p>
+
+    <div class="content-wrapper">
+      <nav class="navigation">
+        <ul class="nav-groups">
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="../DataSources.html">DataSources</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="../Classes/TableViewDiffableDataSource.html">TableViewDiffableDataSource</a>
+              </li>
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="../Classes/CollectionViewDiffableDataSource.html">CollectionViewDiffableDataSource</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="../Snapshot.html">Snapshot</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="../Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </nav>
+      <article class="main-content">
+
+        <section class="section">
+          <div class="section-content">
+            <h1>CollectionViewDiffableDataSource</h1>
+              <div class="declaration">
+                <div class="language">
+                  <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">class</span> <span class="kt">CollectionViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">UICollectionViewDataSource</span> <span class="k">where</span> <span class="kt">SectionIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span></code></pre>
+
+                </div>
+              </div>
+            <p>A class for backporting <code>UICollectionViewDiffableDataSource</code> introduced in iOS 13.0+, tvOS 13.0+.
+Represents the data model object for <code>UICollectionView</code> that can be applies the
+changes with automatic diffing.</p>
+
+          </div>
+        </section>
+
+        <section class="section">
+          <div class="section-content">
+            <div class="task-group">
+              <ul class="item-container">
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC12CellProvidera"></a>
+                    <a name="//apple_ref/swift/Alias/CellProvider" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC12CellProvidera">CellProvider</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The type of closure providing the cell.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">typealias</span> <span class="kt">CellProvider</span> <span class="o">=</span> <span class="p">(</span><span class="kt">UICollectionView</span><span class="p">,</span> <span class="kt">IndexPath</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">UICollectionViewCell</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC013SupplementaryE8Providera"></a>
+                    <a name="//apple_ref/swift/Alias/SupplementaryViewProvider" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC013SupplementaryE8Providera">SupplementaryViewProvider</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The type of closure providing the supplementary view for element of kind.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">typealias</span> <span class="kt">SupplementaryViewProvider</span> <span class="o">=</span> <span class="p">(</span><span class="kt">UICollectionView</span><span class="p">,</span> <span class="kt">String</span><span class="p">,</span> <span class="kt">IndexPath</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">UICollectionReusableView</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC013supplementaryE8ProviderSo020UICollectionReusableE0CSgSo0iE0C_SS10Foundation9IndexPathVtcSgvp"></a>
+                    <a name="//apple_ref/swift/Property/supplementaryViewProvider" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC013supplementaryE8ProviderSo020UICollectionReusableE0CSgSo0iE0C_SS10Foundation9IndexPathVtcSgvp">supplementaryViewProvider</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A closure to dequeue the views for element of kind.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">supplementaryViewProvider</span><span class="p">:</span> <span class="kt">CollectionViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;.</span><span class="kt"><a href="../Classes/CollectionViewDiffableDataSource.html#/s:19DiffableDataSources014CollectionViewaB6SourceC013SupplementaryE8Providera">SupplementaryViewProvider</a></span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE012cellProviderACyxq_GSo012UICollectionE0C_So0jE4CellCSgAH_10Foundation9IndexPathVq_tctcfc"></a>
+                    <a name="//apple_ref/swift/Method/init(collectionView:cellProvider:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE012cellProviderACyxq_GSo012UICollectionE0C_So0jE4CellCSgAH_10Foundation9IndexPathVq_tctcfc">init(collectionView:cellProvider:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Creates a new data source.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">collectionView</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="p">,</span> <span class="nv">cellProvider</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="kt"><a href="../Classes/CollectionViewDiffableDataSource.html#/s:19DiffableDataSources014CollectionViewaB6SourceC12CellProvidera">CellProvider</a></span><span class="p">)</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>collectionView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A collection view instance to be managed.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>cellProvider</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A closure to dequeue the cell for items.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC5apply_20animatingDifferencesyAA0abF8SnapshotCyxq_G_SbtF"></a>
+                    <a name="//apple_ref/swift/Method/apply(_:animatingDifferences:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC5apply_20animatingDifferencesyAA0abF8SnapshotCyxq_G_SbtF">apply(_:animatingDifferences:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Applies given snapshot to perform automatic diffing update.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">apply</span><span class="p">(</span><span class="n">_</span> <span class="nv">snapshot</span><span class="p">:</span> <span class="kt"><a href="../Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a></span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span><span class="p">,</span> <span class="nv">animatingDifferences</span><span class="p">:</span> <span class="kt">Bool</span> <span class="o">=</span> <span class="kc">true</span><span class="p">)</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>snapshot</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A snapshot object to be applied to data model.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>animatingDifferences</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A Boolean value indicating whether to update with
+                  diffing animation.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC8snapshotAA0abF8SnapshotCyxq_GyF"></a>
+                    <a name="//apple_ref/swift/Method/snapshot()" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC8snapshotAA0abF8SnapshotCyxq_GyF">snapshot()</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns a new snapshot object of current state.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">snapshot</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt"><a href="../Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a></span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>A new snapshot object of current state.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC14itemIdentifier3forq_Sg10Foundation9IndexPathV_tF"></a>
+                    <a name="//apple_ref/swift/Method/itemIdentifier(for:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC14itemIdentifier3forq_Sg10Foundation9IndexPathV_tF">itemIdentifier(for:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns an item identifier for given index path.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">itemIdentifier</span><span class="p">(</span><span class="k">for</span> <span class="nv">indexPath</span><span class="p">:</span> <span class="kt">IndexPath</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">ItemIdentifierType</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>indexPath</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index path for the item identifier.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>An item identifier for given index path.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC9indexPath3for10Foundation05IndexH0VSgq__tF"></a>
+                    <a name="//apple_ref/swift/Method/indexPath(for:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC9indexPath3for10Foundation05IndexH0VSgq__tF">indexPath(for:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns an index path for given item identifier.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">indexPath</span><span class="p">(</span><span class="k">for</span> <span class="nv">itemIdentifier</span><span class="p">:</span> <span class="kt">ItemIdentifierType</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">IndexPath</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>itemIdentifier</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An identifier of item.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>An index path for given item identifier.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC16numberOfSections2inSiSo012UICollectionE0C_tF"></a>
+                    <a name="//apple_ref/swift/Method/numberOfSections(in:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC16numberOfSections2inSiSo012UICollectionE0C_tF">numberOfSections(in:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns the number of sections in the data source.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">numberOfSections</span><span class="p">(</span><span class="k">in</span> <span class="nv">collectionView</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>collectionView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A collection view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>The number of sections in the data source.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE0_22numberOfItemsInSectionSiSo012UICollectionE0C_SitF"></a>
+                    <a name="//apple_ref/swift/Method/collectionView(_:numberOfItemsInSection:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE0_22numberOfItemsInSectionSiSo012UICollectionE0C_SitF">collectionView(_:numberOfItemsInSection:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns the number of items in the specified section.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">collectionView</span><span class="p">(</span><span class="n">_</span> <span class="nv">collectionView</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="p">,</span> <span class="n">numberOfItemsInSection</span> <span class="nv">section</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>collectionView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A collection view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>section</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index of section.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>The number of items in the specified section.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE0_13cellForItemAtSo012UICollectionE4CellCSo0lE0C_10Foundation9IndexPathVtF"></a>
+                    <a name="//apple_ref/swift/Method/collectionView(_:cellForItemAt:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE0_13cellForItemAtSo012UICollectionE4CellCSo0lE0C_10Foundation9IndexPathVtF">collectionView(_:cellForItemAt:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns a cell for item at specified index path.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">func</span> <span class="nf">collectionView</span><span class="p">(</span><span class="n">_</span> <span class="nv">collectionView</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="p">,</span> <span class="n">cellForItemAt</span> <span class="nv">indexPath</span><span class="p">:</span> <span class="kt">IndexPath</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">UICollectionViewCell</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>collectionView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A collection view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>indexPath</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index path for cell.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>A cell for row at specified index path.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE0_33viewForSupplementaryElementOfKind2atSo020UICollectionReusableE0CSo0oE0C_SS10Foundation9IndexPathVtF"></a>
+                    <a name="//apple_ref/swift/Method/collectionView(_:viewForSupplementaryElementOfKind:at:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC010collectionE0_33viewForSupplementaryElementOfKind2atSo020UICollectionReusableE0CSo0oE0C_SS10Foundation9IndexPathVtF">collectionView(_:viewForSupplementaryElementOfKind:at:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns a supplementary view for element of kind at specified index path.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">func</span> <span class="nf">collectionView</span><span class="p">(</span><span class="n">_</span> <span class="nv">collectionView</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="p">,</span> <span class="n">viewForSupplementaryElementOfKind</span> <span class="nv">kind</span><span class="p">:</span> <span class="kt">String</span><span class="p">,</span> <span class="n">at</span> <span class="nv">indexPath</span><span class="p">:</span> <span class="kt">IndexPath</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">UICollectionReusableView</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>collectionView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A collection view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>kind</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>The kind of element to be display.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>indexPath</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index path for supplementary view.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>A supplementary view for element of kind at specified index path.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
+          </div>
+        </section>
+
+      </article>
+    </div>
+    <section class="footer">
+      <p>&copy; 2019 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2019-06-24)</p>
+      <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
+    </section>
+  </body>
+</div>
+</html>
@@ -0,0 +1,585 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>TableViewDiffableDataSource Class Reference</title>
+    <link rel="stylesheet" type="text/css" href="../css/jazzy.css" />
+    <link rel="stylesheet" type="text/css" href="../css/highlight.css" />
+    <meta charset="utf-8">
+    <script src="../js/jquery.min.js" defer></script>
+    <script src="../js/jazzy.js" defer></script>
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+    <script src="../js/lunr.min.js" defer></script>
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+    <script src="../js/jazzy.search.js" defer></script>
+  </head>
+  <body>
+
+    <a name="//apple_ref/swift/Class/TableViewDiffableDataSource" class="dashAnchor"></a>
+
+    <a title="TableViewDiffableDataSource Class Reference"></a>
+
+    <header class="header">
+      <p class="header-col header-col--primary">
+        <a class="header-link" href="../index.html">
+          DiffableDataSources Docs
+        </a>
+         (100% documented)
+      </p>
+    
+      <p class="header-col--secondary">
+        <form role="search" action="../search.json">
+          <input type="text" placeholder="Search documentation" data-typeahead>
+        </form>
+      </p>
+    
+        <p class="header-col header-col--secondary">
+          <a class="header-link" href="https://github.com/ra1028/DiffableDataSources">
+            <img class="header-icon" src="../img/gh.png"/>
+            View on GitHub
+          </a>
+        </p>
+    
+    </header>
+
+    <p class="breadcrumbs">
+      <a class="breadcrumb" href="../index.html">DiffableDataSources Reference</a>
+      <img class="carat" src="../img/carat.png" />
+      TableViewDiffableDataSource Class Reference
+    </p>
+
+    <div class="content-wrapper">
+      <nav class="navigation">
+        <ul class="nav-groups">
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="../DataSources.html">DataSources</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="../Classes/TableViewDiffableDataSource.html">TableViewDiffableDataSource</a>
+              </li>
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="../Classes/CollectionViewDiffableDataSource.html">CollectionViewDiffableDataSource</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="../Snapshot.html">Snapshot</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="../Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </nav>
+      <article class="main-content">
+
+        <section class="section">
+          <div class="section-content">
+            <h1>TableViewDiffableDataSource</h1>
+              <div class="declaration">
+                <div class="language">
+                  <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">class</span> <span class="kt">TableViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">UITableViewDataSource</span> <span class="k">where</span> <span class="kt">SectionIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span></code></pre>
+
+                </div>
+              </div>
+            <p>A class for backporting <code>UITableViewDiffableDataSource</code> introduced in iOS 13.0+, tvOS 13.0+.
+Represents the data model object for <code>UITableView</code> that can be applies the
+changes with automatic diffing.</p>
+
+          </div>
+        </section>
+
+        <section class="section">
+          <div class="section-content">
+            <div class="task-group">
+              <ul class="item-container">
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC12CellProvidera"></a>
+                    <a name="//apple_ref/swift/Alias/CellProvider" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC12CellProvidera">CellProvider</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The type of closure providing the cell.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">typealias</span> <span class="kt">CellProvider</span> <span class="o">=</span> <span class="p">(</span><span class="kt">UITableView</span><span class="p">,</span> <span class="kt">IndexPath</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">UITableViewCell</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC19defaultRowAnimationSo07UITableehI0Vvp"></a>
+                    <a name="//apple_ref/swift/Property/defaultRowAnimation" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC19defaultRowAnimationSo07UITableehI0Vvp">defaultRowAnimation</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>The default animation to updating the views.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">defaultRowAnimation</span><span class="p">:</span> <span class="kt">UITableView</span><span class="o">.</span><span class="kt">RowAnimation</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC05tableE012cellProviderACyxq_GSo07UITableE0C_So0jE4CellCSgAH_10Foundation9IndexPathVq_tctcfc"></a>
+                    <a name="//apple_ref/swift/Method/init(tableView:cellProvider:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC05tableE012cellProviderACyxq_GSo07UITableE0C_So0jE4CellCSgAH_10Foundation9IndexPathVq_tctcfc">init(tableView:cellProvider:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Creates a new data source.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">tableView</span><span class="p">:</span> <span class="kt">UITableView</span><span class="p">,</span> <span class="nv">cellProvider</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="kt"><a href="../Classes/TableViewDiffableDataSource.html#/s:19DiffableDataSources09TableViewaB6SourceC12CellProvidera">CellProvider</a></span><span class="p">)</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>tableView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A table view instance to be managed.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>cellProvider</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A closure to dequeue the cell for rows.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC5apply_20animatingDifferencesyAA0abF8SnapshotCyxq_G_SbtF"></a>
+                    <a name="//apple_ref/swift/Method/apply(_:animatingDifferences:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC5apply_20animatingDifferencesyAA0abF8SnapshotCyxq_G_SbtF">apply(_:animatingDifferences:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Applies given snapshot to perform automatic diffing update.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">apply</span><span class="p">(</span><span class="n">_</span> <span class="nv">snapshot</span><span class="p">:</span> <span class="kt"><a href="../Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a></span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span><span class="p">,</span> <span class="nv">animatingDifferences</span><span class="p">:</span> <span class="kt">Bool</span> <span class="o">=</span> <span class="kc">true</span><span class="p">)</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>snapshot</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A snapshot object to be applied to data model.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>animatingDifferences</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A Boolean value indicating whether to update with
+                  diffing animation.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC8snapshotAA0abF8SnapshotCyxq_GyF"></a>
+                    <a name="//apple_ref/swift/Method/snapshot()" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC8snapshotAA0abF8SnapshotCyxq_GyF">snapshot()</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns a new snapshot object of current state.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">snapshot</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt"><a href="../Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a></span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>A new snapshot object of current state.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC14itemIdentifier3forq_Sg10Foundation9IndexPathV_tF"></a>
+                    <a name="//apple_ref/swift/Method/itemIdentifier(for:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC14itemIdentifier3forq_Sg10Foundation9IndexPathV_tF">itemIdentifier(for:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns an item identifier for given index path.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">itemIdentifier</span><span class="p">(</span><span class="k">for</span> <span class="nv">indexPath</span><span class="p">:</span> <span class="kt">IndexPath</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">ItemIdentifierType</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>indexPath</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index path for the item identifier.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>An item identifier for given index path.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC9indexPath3for10Foundation05IndexH0VSgq__tF"></a>
+                    <a name="//apple_ref/swift/Method/indexPath(for:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC9indexPath3for10Foundation05IndexH0VSgq__tF">indexPath(for:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns an index path for given item identifier.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">indexPath</span><span class="p">(</span><span class="k">for</span> <span class="nv">itemIdentifier</span><span class="p">:</span> <span class="kt">ItemIdentifierType</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">IndexPath</span><span class="p">?</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>itemIdentifier</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An identifier of item.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>An index path for given item identifier.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC16numberOfSections2inSiSo07UITableE0C_tF"></a>
+                    <a name="//apple_ref/swift/Method/numberOfSections(in:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC16numberOfSections2inSiSo07UITableE0C_tF">numberOfSections(in:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns the number of sections in the data source.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">numberOfSections</span><span class="p">(</span><span class="k">in</span> <span class="nv">tableView</span><span class="p">:</span> <span class="kt">UITableView</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>tableView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A table view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>The number of sections in the data source.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC05tableE0_21numberOfRowsInSectionSiSo07UITableE0C_SitF"></a>
+                    <a name="//apple_ref/swift/Method/tableView(_:numberOfRowsInSection:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC05tableE0_21numberOfRowsInSectionSiSo07UITableE0C_SitF">tableView(_:numberOfRowsInSection:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns the number of items in the specified section.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">tableView</span><span class="p">(</span><span class="n">_</span> <span class="nv">tableView</span><span class="p">:</span> <span class="kt">UITableView</span><span class="p">,</span> <span class="n">numberOfRowsInSection</span> <span class="nv">section</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>tableView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A table view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>section</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index of section.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>The number of items in the specified section.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC05tableE0_12cellForRowAtSo07UITableE4CellCSo0lE0C_10Foundation9IndexPathVtF"></a>
+                    <a name="//apple_ref/swift/Method/tableView(_:cellForRowAt:)" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC05tableE0_12cellForRowAtSo07UITableE4CellCSo0lE0C_10Foundation9IndexPathVtF">tableView(_:cellForRowAt:)</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>Returns a cell for row at specified index path.</p>
+
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">func</span> <span class="nf">tableView</span><span class="p">(</span><span class="n">_</span> <span class="nv">tableView</span><span class="p">:</span> <span class="kt">UITableView</span><span class="p">,</span> <span class="n">cellForRowAt</span> <span class="nv">indexPath</span><span class="p">:</span> <span class="kt">IndexPath</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">UITableViewCell</span></code></pre>
+
+                        </div>
+                      </div>
+                      <div>
+                        <h4>Parameters</h4>
+                        <table class="graybox">
+                          <tbody>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>tableView</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>A table view instance managed by <code>self</code>.</p>
+                                </div>
+                              </td>
+                            </tr>
+                            <tr>
+                              <td>
+                                <code>
+                                <em>indexPath</em>
+                                </code>
+                              </td>
+                              <td>
+                                <div>
+                                  <p>An index path for cell.</p>
+                                </div>
+                              </td>
+                            </tr>
+                          </tbody>
+                        </table>
+                      </div>
+                      <div>
+                        <h4>Return Value</h4>
+                        <p>A cell for row at specified index path.</p>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
+          </div>
+        </section>
+
+      </article>
+    </div>
+    <section class="footer">
+      <p>&copy; 2019 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2019-06-24)</p>
+      <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
+    </section>
+  </body>
+</div>
+</html>
@@ -0,0 +1,164 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>DataSources  Reference</title>
+    <link rel="stylesheet" type="text/css" href="css/jazzy.css" />
+    <link rel="stylesheet" type="text/css" href="css/highlight.css" />
+    <meta charset="utf-8">
+    <script src="js/jquery.min.js" defer></script>
+    <script src="js/jazzy.js" defer></script>
+    
+    <script src="js/lunr.min.js" defer></script>
+    <script src="js/typeahead.jquery.js" defer></script>
+    <script src="js/jazzy.search.js" defer></script>
+  </head>
+  <body>
+
+    <a name="//apple_ref/swift/Section/DataSources" class="dashAnchor"></a>
+
+    <a title="DataSources  Reference"></a>
+
+    <header class="header">
+      <p class="header-col header-col--primary">
+        <a class="header-link" href="index.html">
+          DiffableDataSources Docs
+        </a>
+         (100% documented)
+      </p>
+    
+      <p class="header-col--secondary">
+        <form role="search" action="search.json">
+          <input type="text" placeholder="Search documentation" data-typeahead>
+        </form>
+      </p>
+    
+        <p class="header-col header-col--secondary">
+          <a class="header-link" href="https://github.com/ra1028/DiffableDataSources">
+            <img class="header-icon" src="img/gh.png"/>
+            View on GitHub
+          </a>
+        </p>
+    
+    </header>
+
+    <p class="breadcrumbs">
+      <a class="breadcrumb" href="index.html">DiffableDataSources Reference</a>
+      <img class="carat" src="img/carat.png" />
+      DataSources  Reference
+    </p>
+
+    <div class="content-wrapper">
+      <nav class="navigation">
+        <ul class="nav-groups">
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="DataSources.html">DataSources</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/TableViewDiffableDataSource.html">TableViewDiffableDataSource</a>
+              </li>
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/CollectionViewDiffableDataSource.html">CollectionViewDiffableDataSource</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="Snapshot.html">Snapshot</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </nav>
+      <article class="main-content">
+
+        <section class="section">
+          <div class="section-content">
+            <h1>DataSources</h1>
+            
+          </div>
+        </section>
+
+        <section class="section">
+          <div class="section-content">
+            <div class="task-group">
+              <ul class="item-container">
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources09TableViewaB6SourceC"></a>
+                    <a name="//apple_ref/swift/Class/TableViewDiffableDataSource" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources09TableViewaB6SourceC">TableViewDiffableDataSource</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A class for backporting <code>UITableViewDiffableDataSource</code> introduced in iOS 13.0+, tvOS 13.0+.
+Represents the data model object for <code>UITableView</code> that can be applies the
+changes with automatic diffing.</p>
+
+                        <a href="Classes/TableViewDiffableDataSource.html" class="slightly-smaller">See more</a>
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">class</span> <span class="kt">TableViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">UITableViewDataSource</span> <span class="k">where</span> <span class="kt">SectionIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
+            <div class="task-group">
+              <ul class="item-container">
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources014CollectionViewaB6SourceC"></a>
+                    <a name="//apple_ref/swift/Class/CollectionViewDiffableDataSource" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources014CollectionViewaB6SourceC">CollectionViewDiffableDataSource</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A class for backporting <code>UICollectionViewDiffableDataSource</code> introduced in iOS 13.0+, tvOS 13.0+.
+Represents the data model object for <code>UICollectionView</code> that can be applies the
+changes with automatic diffing.</p>
+
+                        <a href="Classes/CollectionViewDiffableDataSource.html" class="slightly-smaller">See more</a>
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">class</span> <span class="kt">CollectionViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">UICollectionViewDataSource</span> <span class="k">where</span> <span class="kt">SectionIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
+          </div>
+        </section>
+
+      </article>
+    </div>
+    <section class="footer">
+      <p>&copy; 2019 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2019-06-24)</p>
+      <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
+    </section>
+  </body>
+</div>
+</html>
@@ -0,0 +1,129 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>Snapshot  Reference</title>
+    <link rel="stylesheet" type="text/css" href="css/jazzy.css" />
+    <link rel="stylesheet" type="text/css" href="css/highlight.css" />
+    <meta charset="utf-8">
+    <script src="js/jquery.min.js" defer></script>
+    <script src="js/jazzy.js" defer></script>
+    
+    <script src="js/lunr.min.js" defer></script>
+    <script src="js/typeahead.jquery.js" defer></script>
+    <script src="js/jazzy.search.js" defer></script>
+  </head>
+  <body>
+
+    <a name="//apple_ref/swift/Section/Snapshot" class="dashAnchor"></a>
+
+    <a title="Snapshot  Reference"></a>
+
+    <header class="header">
+      <p class="header-col header-col--primary">
+        <a class="header-link" href="index.html">
+          DiffableDataSources Docs
+        </a>
+         (100% documented)
+      </p>
+    
+      <p class="header-col--secondary">
+        <form role="search" action="search.json">
+          <input type="text" placeholder="Search documentation" data-typeahead>
+        </form>
+      </p>
+    
+        <p class="header-col header-col--secondary">
+          <a class="header-link" href="https://github.com/ra1028/DiffableDataSources">
+            <img class="header-icon" src="img/gh.png"/>
+            View on GitHub
+          </a>
+        </p>
+    
+    </header>
+
+    <p class="breadcrumbs">
+      <a class="breadcrumb" href="index.html">DiffableDataSources Reference</a>
+      <img class="carat" src="img/carat.png" />
+      Snapshot  Reference
+    </p>
+
+    <div class="content-wrapper">
+      <nav class="navigation">
+        <ul class="nav-groups">
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="DataSources.html">DataSources</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/TableViewDiffableDataSource.html">TableViewDiffableDataSource</a>
+              </li>
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/CollectionViewDiffableDataSource.html">CollectionViewDiffableDataSource</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="Snapshot.html">Snapshot</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </nav>
+      <article class="main-content">
+
+        <section class="section">
+          <div class="section-content">
+            <h1>Snapshot</h1>
+            
+          </div>
+        </section>
+
+        <section class="section">
+          <div class="section-content">
+            <div class="task-group">
+              <ul class="item-container">
+                <li class="item">
+                  <div>
+                    <code>
+                    <a name="/s:19DiffableDataSources0aB14SourceSnapshotC"></a>
+                    <a name="//apple_ref/swift/Class/DiffableDataSourceSnapshot" class="dashAnchor"></a>
+                    <a class="token" href="#/s:19DiffableDataSources0aB14SourceSnapshotC">DiffableDataSourceSnapshot</a>
+                    </code>
+                  </div>
+                  <div class="height-container">
+                    <div class="pointer-container"></div>
+                    <section class="section">
+                      <div class="pointer"></div>
+                      <div class="abstract">
+                        <p>A class for backporting <code>NSDiffableDataSourceSnapshot</code> introduced in iOS 13.0+, macOS 10.15+, tvOS 13.0+.
+Represents the mutable state of diffable data source of UI.</p>
+
+                        <a href="Classes/DiffableDataSourceSnapshot.html" class="slightly-smaller">See more</a>
+                      </div>
+                      <div class="declaration">
+                        <h4>Declaration</h4>
+                        <div class="language">
+                          <p class="aside-title">Swift</p>
+                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">DiffableDataSourceSnapshot</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span> <span class="k">where</span> <span class="kt">SectionIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span> <span class="p">:</span> <span class="kt">Hashable</span></code></pre>
+
+                        </div>
+                      </div>
+                    </section>
+                  </div>
+                </li>
+              </ul>
+            </div>
+          </div>
+        </section>
+
+      </article>
+    </div>
+    <section class="footer">
+      <p>&copy; 2019 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2019-06-24)</p>
+      <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
+    </section>
+  </body>
+</div>
+</html>
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+    padding: 7px;
+    vertical-align: top;
+    word-break: normal;
+    width: 40px; }
+
+.slightly-smaller {
+  font-size: 0.9em; }
+
+.footer {
+  padding: 8px 16px;
+  background: #444;
+  color: #ddd;
+  font-size: 0.8em; }
+  .footer p {
+    margin: 8px 0; }
+  .footer a {
+    color: #fff; }
+
+html.dash .header, html.dash .breadcrumbs, html.dash .navigation {
+  display: none; }
+html.dash .height-container {
+  display: block; }
+
+form[role=search] input {
+  font: 16px/1.7 "Helvetica Neue", Helvetica, Arial, sans-serif;
+  font-size: 14px;
+  line-height: 24px;
+  padding: 0 10px;
+  margin: 0;
+  border: none;
+  border-radius: 1em; }
+  .loading form[role=search] input {
+    background: white url(../img/spinner.gif) center right 4px no-repeat; }
+form[role=search] .tt-menu {
+  margin: 0;
+  min-width: 300px;
+  background: #fbfbfb;
+  color: #333;
+  border: 1px solid #ddd; }
+form[role=search] .tt-highlight {
+  font-weight: bold; }
+form[role=search] .tt-suggestion {
+  font: 16px/1.7 "Helvetica Neue", Helvetica, Arial, sans-serif;
+  padding: 0 8px; }
+  form[role=search] .tt-suggestion span {
+    display: table-cell;
+    white-space: nowrap; }
+  form[role=search] .tt-suggestion .doc-parent-name {
+    width: 100%;
+    text-align: right;
+    font-weight: normal;
+    font-size: 0.9em;
+    padding-left: 16px; }
+form[role=search] .tt-suggestion:hover,
+form[role=search] .tt-suggestion.tt-cursor {
+  cursor: pointer;
+  background-color: #4183c4;
+  color: #fff; }
+form[role=search] .tt-suggestion:hover .doc-parent-name,
+form[role=search] .tt-suggestion.tt-cursor .doc-parent-name {
+  color: #fff; }
@@ -0,0 +1,293 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>DiffableDataSources  Reference</title>
+    <link rel="stylesheet" type="text/css" href="css/jazzy.css" />
+    <link rel="stylesheet" type="text/css" href="css/highlight.css" />
+    <meta charset="utf-8">
+    <script src="js/jquery.min.js" defer></script>
+    <script src="js/jazzy.js" defer></script>
+    
+    <script src="js/lunr.min.js" defer></script>
+    <script src="js/typeahead.jquery.js" defer></script>
+    <script src="js/jazzy.search.js" defer></script>
+  </head>
+  <body>
+
+
+    <a title="DiffableDataSources  Reference"></a>
+
+    <header class="header">
+      <p class="header-col header-col--primary">
+        <a class="header-link" href="index.html">
+          DiffableDataSources Docs
+        </a>
+         (100% documented)
+      </p>
+    
+      <p class="header-col--secondary">
+        <form role="search" action="search.json">
+          <input type="text" placeholder="Search documentation" data-typeahead>
+        </form>
+      </p>
+    
+        <p class="header-col header-col--secondary">
+          <a class="header-link" href="https://github.com/ra1028/DiffableDataSources">
+            <img class="header-icon" src="img/gh.png"/>
+            View on GitHub
+          </a>
+        </p>
+    
+    </header>
+
+    <p class="breadcrumbs">
+      <a class="breadcrumb" href="index.html">DiffableDataSources Reference</a>
+      <img class="carat" src="img/carat.png" />
+      DiffableDataSources  Reference
+    </p>
+
+    <div class="content-wrapper">
+      <nav class="navigation">
+        <ul class="nav-groups">
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="DataSources.html">DataSources</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/TableViewDiffableDataSource.html">TableViewDiffableDataSource</a>
+              </li>
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/CollectionViewDiffableDataSource.html">CollectionViewDiffableDataSource</a>
+              </li>
+            </ul>
+          </li>
+          <li class="nav-group-name">
+            <a class="nav-group-name-link" href="Snapshot.html">Snapshot</a>
+            <ul class="nav-group-tasks">
+              <li class="nav-group-task">
+                <a class="nav-group-task-link" href="Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </nav>
+      <article class="main-content">
+
+        <section class="section">
+          <div class="section-content">
+            
+            <H1 align="center">
+DiffableDataSources
+</H1>
+
+<H4 align="center">
+💾 A library for backporting UITableView/UICollectionViewDiffableDataSource</br>
+powered by <a href="https://github.com/ra1028/DifferenceKit">DifferenceKit</a>.
+</H4>
+
+<p align="center">
+<a href="https://developer.apple.com/swift"><img alt="Swift5" src="https://img.shields.io/badge/language-Swift5-orange.svg"/></a>
+<a href="https://github.com/ra1028/DiffableDataSources/releases/latest"><img alt="Release" src="https://img.shields.io/github/release/ra1028/DiffableDataSources.svg"/></a>
+<a href="https://cocoapods.org/pods/DiffableDataSources"><img alt="CocoaPods" src="https://img.shields.io/cocoapods/v/DiffableDataSources.svg"/></a>
+<a href="https://github.com/Carthage/Carthage"><img alt="Carthage" src="https://img.shields.io/badge/carthage-compatible-yellow.svg"/></a>
+<a href="https://swift.org/package-manager"><img alt="Swift Package Manager" src="https://img.shields.io/badge/SwiftPM-compatible-yellowgreen.svg"/></a>
+</br>
+<a href="https://dev.azure.com/ra1028/GitHub/_build/latest?definitionId=3&branchName=master"><img alt="Build Status" src="https://dev.azure.com/ra1028/GitHub/_apis/build/status/ra1028.DiffableDataSources?branchName=master"/></a>
+<a href="https://developer.apple.com/"><img alt="Platform" src="https://img.shields.io/badge/platform-iOS%20%7C%20macOS%20%7C%20tvOS-green.svg"/></a>
+<a href="https://github.com/ra1028/DiffableDataSources/blob/master/LICENSE"><img alt="Lincense" src="https://img.shields.io/badge/License-Apache%202.0-black.svg"/></a>
+</p>
+
+<p align="center">
+Made with ❤️ by <a href="https://github.com/ra1028">Ryo Aoyama</a>
+</p>
+
+<hr>
+<h2 id='introduction' class='heading'>Introduction</h2>
+
+<p><img src="https://raw.githubusercontent.com/ra1028/DiffableDataSources/master/assets/insertion_sort.gif" height="400" align="right">
+<img src="https://raw.githubusercontent.com/ra1028/DiffableDataSources/master/assets/mountains.gif" height="400" align="right"></p>
+
+<p>Apple has announced a diffable data source at WWDC 2019.<br>
+It&rsquo;s a great API that easily updating our table view and collection view items using automatic diffing.<br>
+However, it&rsquo;s a little while before we can use it in a production service.<br>
+That because it requires the latest OS to use.<br>
+DiffableDataSources make it possible to introduce almost the same functionality from now on.  </p>
+
+<p>Uses a sophisticated open source <a href="https://github.com/ra1028/DifferenceKit">DifferenceKit</a> for the algorithm engine.<br>
+It&rsquo;s extremely fast and completely avoids synchronization bugs, exceptions, and crashes.  </p>
+
+<p><br clear="all"></p>
+
+<hr>
+<h2 id='difference-from-the-official' class='heading'>Difference from the Official</h2>
+<h4 id='spec' class='heading'>Spec</h4>
+
+<ul>
+<li>Supports iOS 9.0+ / macOS 10.11+ / tvOS 9.0+</li>
+<li>Open sourced algorithm.</li>
+<li>Duplicate sections or items are allowed.<br></li>
+<li>Using <code>performBatchUpdates</code> for diffing updates.</li>
+</ul>
+<h4 id='namings' class='heading'>Namings</h4>
+
+<p><code>DiffableDataSources</code> have different class names to avoid conflicts with the official API.<br>
+Correspondence table is below.  </p>
+
+<table><thead>
+<tr>
+<th style="text-align: left">Official</th>
+<th style="text-align: left">Backported</th>
+</tr>
+</thead><tbody>
+<tr>
+<td style="text-align: left"><a href="https://developer.apple.com/documentation/uikit/uitableviewdiffabledatasource">NSDiffableDataSourceSnapshot</a></td>
+<td style="text-align: left">DiffableDataSourceSnapshot</td>
+</tr>
+<tr>
+<td style="text-align: left"><a href="https://developer.apple.com/documentation/uikit/uitableviewdiffabledatasource">UITableViewDiffableDataSource</a></td>
+<td style="text-align: left">TableViewDiffableDataSource</td>
+</tr>
+<tr>
+<td style="text-align: left"><a href="https://developer.apple.com/documentation/uikit/uicollectionviewdiffabledatasource">UICollectionViewDiffableDataSource</a></td>
+<td style="text-align: left">CollectionViewDiffableDataSource</td>
+</tr>
+<tr>
+<td style="text-align: left"><a href="https://developer.apple.com/documentation/appkit/nscollectionviewdiffabledatasource">NSCollectionViewDiffableDataSource</a></td>
+<td style="text-align: left">CocoaCollectionViewDiffableDataSource</td>
+</tr>
+</tbody></table>
+
+<hr>
+<h2 id='getting-started' class='heading'>Getting Started</h2>
+
+<ul>
+<li><a href="https://ra1028.github.io/DiffableDataSources">API Documentation</a></li>
+<li><a href="https://github.com/ra1028/DiffableDataSources/tree/master/Examples">Example Apps</a></li>
+<li><a href="https://developer.apple.com/videos/play/wwdc2019/220">WWDC 2019 Session</a></li>
+</ul>
+<h4 id='build-project' class='heading'>Build Project</h4>
+<pre class="highlight shell"><code><span class="nv">$ </span>git clone https://github.com/ra1028/DiffableDataSources.git
+<span class="nv">$ </span><span class="nb">cd </span>DiffableDataSources/
+<span class="nv">$ </span>make setup
+<span class="nv">$ </span>open DiffableDataSources.xcworkspace
+</code></pre>
+
+<hr>
+<h2 id='basic-usage' class='heading'>Basic Usage</h2>
+
+<p>First, define the type representing section.<br>
+It should conforms to <code>Hashable</code> for identifies from the all sections.<br>
+Type of enum can used conveniently befause it conforms <code>Hashable</code> by default.  </p>
+<pre class="highlight swift"><code><span class="kd">enum</span> <span class="kt">Section</span> <span class="p">{</span>
+    <span class="k">case</span> <span class="n">main</span>
+<span class="p">}</span>
+</code></pre>
+
+<p>Then, define the item type conforms to <code>Hashable</code>.  </p>
+<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">User</span><span class="p">:</span> <span class="kt">Hashable</span> <span class="p">{</span>
+    <span class="k">var</span> <span class="nv">name</span><span class="p">:</span> <span class="kt">String</span>
+<span class="p">}</span>
+</code></pre>
+
+<p>Create a data source object, it will be set to table view automatically.<br>
+You should dequeue the non nil cells via closure.  </p>
+<pre class="highlight swift"><code><span class="kd">final</span> <span class="kd">class</span> <span class="kt">UsersViewController</span><span class="p">:</span> <span class="kt">UIViewController</span> <span class="p">{</span>
+    <span class="k">let</span> <span class="nv">tableView</span><span class="p">:</span> <span class="kt">UITableView</span> <span class="o">=</span> <span class="o">...</span>
+
+    <span class="kd">lazy</span> <span class="k">var</span> <span class="nv">dataSource</span> <span class="o">=</span> <span class="kt">TableViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">Section</span><span class="p">,</span> <span class="kt">User</span><span class="o">&gt;</span><span class="p">(</span><span class="nv">tableView</span><span class="p">:</span> <span class="n">tableView</span><span class="p">)</span> <span class="p">{</span> <span class="n">tableView</span><span class="p">,</span> <span class="n">indexPath</span><span class="p">,</span> <span class="n">user</span> <span class="k">in</span>
+        <span class="k">let</span> <span class="nv">cell</span> <span class="o">=</span> <span class="n">tableView</span><span class="o">.</span><span class="nf">dequeueReusableCell</span><span class="p">(</span><span class="nv">withIdentifier</span><span class="p">:</span> <span class="s">"Cell"</span><span class="p">,</span> <span class="nv">for</span><span class="p">:</span> <span class="n">indexPath</span><span class="p">)</span>
+        <span class="n">cell</span><span class="o">.</span><span class="n">textLabel</span><span class="p">?</span><span class="o">.</span><span class="n">text</span> <span class="o">=</span> <span class="n">user</span><span class="o">.</span><span class="n">name</span>
+        <span class="k">return</span> <span class="n">cell</span>
+    <span class="p">}</span>
+
+    <span class="k">override</span> <span class="kd">func</span> <span class="nf">viewDidLoad</span><span class="p">()</span> <span class="p">{</span>
+        <span class="k">super</span><span class="o">.</span><span class="nf">viewDidLoad</span><span class="p">()</span>
+
+        <span class="n">tableView</span><span class="o">.</span><span class="nf">register</span><span class="p">(</span><span class="kt">UITableViewCell</span><span class="o">.</span><span class="k">self</span><span class="p">,</span> <span class="nv">forCellReuseIdentifier</span><span class="p">:</span> <span class="s">"Cell"</span><span class="p">)</span>
+    <span class="p">}</span>
+<span class="p">}</span>
+</code></pre>
+
+<p>Manages and updates the data sources intuitively by intermediating <code><a href="Classes/DiffableDataSourceSnapshot.html">DiffableDataSourceSnapshot</a></code>.<br>
+The UI isn&rsquo;t updated until you apply the edited snapshot object.<br>
+Update the UI with diffing animation automatically calculated by applying an edited snapshot.  </p>
+<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">users</span> <span class="o">=</span> <span class="p">[</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">name</span><span class="p">:</span> <span class="s">"Steve Jobs"</span><span class="p">),</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">name</span><span class="p">:</span> <span class="s">"Stephen Wozniak"</span><span class="p">),</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">name</span><span class="p">:</span> <span class="s">"Tim Cook"</span><span class="p">),</span>
+    <span class="kt">User</span><span class="p">(</span><span class="nv">name</span><span class="p">:</span> <span class="s">"Jonathan Ive"</span><span class="p">)</span>
+<span class="p">]</span>
+
+<span class="k">let</span> <span class="nv">snapshot</span> <span class="o">=</span> <span class="kt">DiffableDataSourceSnapshot</span><span class="o">&lt;</span><span class="kt">Section</span><span class="p">,</span> <span class="kt">User</span><span class="o">&gt;</span><span class="p">()</span>
+<span class="n">snapshot</span><span class="o">.</span><span class="nf">appendSections</span><span class="p">([</span><span class="o">.</span><span class="n">main</span><span class="p">])</span>
+<span class="n">snapshot</span><span class="o">.</span><span class="nf">appendItems</span><span class="p">(</span><span class="n">users</span><span class="p">)</span>
+
+<span class="n">dataSource</span><span class="o">.</span><span class="nf">apply</span><span class="p">(</span><span class="n">snapshot</span><span class="p">)</span>
+</code></pre>
+
+<p>Check the documentation for more detailed API.  </p>
+
+<H3 align="center">
+<a href="https://ra1028.github.io/DiffableDataSources">[See More Usage]</a>
+</H3>
+
+<hr>
+<h2 id='requirements' class='heading'>Requirements</h2>
+
+<ul>
+<li>Swift 5.0+</li>
+<li>iOS 9.0+</li>
+<li>macOS 10.11+</li>
+<li>tvOS 9.0+</li>
+</ul>
+
+<hr>
+<h2 id='installation' class='heading'>Installation</h2>
+<h3 id='a-href-https-cocoapods-org-cocoapods-a' class='heading'><a href="https://cocoapods.org">CocoaPods</a></h3>
+
+<p>Add the following to your <code>Podfile</code>:</p>
+<pre class="highlight ruby"><code><span class="n">pod</span> <span class="s1">'DiffableDataSources'</span>
+</code></pre>
+<h3 id='a-href-https-github-com-carthage-carthage-carthage-a' class='heading'><a href="https://github.com/Carthage/Carthage">Carthage</a></h3>
+
+<p>Add the following to your <code>Cartfile</code>:</p>
+<pre class="highlight plaintext"><code>github "ra1028/DiffableDataSources"
+</code></pre>
+<h3 id='a-href-https-swift-org-package-manager-swift-package-manager-a' class='heading'><a href="https://swift.org/package-manager/">Swift Package Manager</a></h3>
+
+<p>Add the following to the dependencies of your <code>Package.swift</code>:</p>
+<pre class="highlight swift"><code><span class="o">.</span><span class="nf">package</span><span class="p">(</span><span class="nv">url</span><span class="p">:</span> <span class="s">"https://github.com/ra1028/DiffableDataSources.git"</span><span class="p">,</span> <span class="nv">from</span><span class="p">:</span> <span class="s">"x.x.x"</span><span class="p">)</span>
+</code></pre>
+
+<hr>
+<h2 id='contributing' class='heading'>Contributing</h2>
+
+<p>Pull requests, bug reports and feature requests are welcome 🚀<br>
+Please see the <a href="https://github.com/ra1028/DiffableDataSources/blob/master/CONTRIBUTING.md">CONTRIBUTING</a> file for learn how to contribute to DiffableDataSources.  </p>
+
+<hr>
+<h2 id='relations' class='heading'>Relations</h2>
+<h4 id='a-href-https-github-com-ra1028-differencekit-differencekit-a' class='heading'><a href="https://github.com/ra1028/DifferenceKit">DifferenceKit</a></h4>
+
+<p>A fast and flexible O(n) difference algorithm framework for Swift collection.</p>
+<h4 id='a-href-https-github-com-ra1028-carbon-carbon-a' class='heading'><a href="https://github.com/ra1028/Carbon">Carbon</a></h4>
+
+<p>A declarative library for building component-based user interfaces in UITableView and UICollectionView.</p>
+
+<hr>
+<h2 id='license' class='heading'>License</h2>
+
+<p>DiffableDataSources is released under the <a href="https://github.com/ra1028/DiffableDataSources/blob/master/LICENSE">Apache 2.0 License</a>.  </p>
+
+          </div>
+        </section>
+
+
+      </article>
+    </div>
+    <section class="footer">
+      <p>&copy; 2019 <a class="link" href="https://github.com/ra1028" target="_blank" rel="external">Ryo Aoyama</a>. All rights reserved. (Last updated: 2019-06-24)</p>
+      <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
+    </section>
+  </body>
+</div>
+</html>
@@ -0,0 +1,43 @@
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+if (typeof window.dash != 'undefined') {
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+  var animationDuration = 300;
+  $content = link.parent().parent().next();
+  $content.slideToggle(animationDuration);
+
+  // Keeps the document from jumping to the hash.
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+  if (history.pushState) {
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+});
@@ -0,0 +1,62 @@
+$(function(){
+  var searchIndex = lunr(function() {
+    this.ref('url');
+    this.field('name');
+  });
+
+  var $typeahead = $('[data-typeahead]');
+  var $form = $typeahead.parents('form');
+  var searchURL = $form.attr('action');
+
+  function displayTemplate(result) {
+    return result.name;
+  }
+
+  function suggestionTemplate(result) {
+    var t = '<div class="list-group-item clearfix">';
+    t += '<span class="doc-name">' + result.name + '</span>';
+    if (result.parent_name) {
+     t += '<span class="doc-parent-name label">' + result.parent_name + '</span>';
+    }
+    t += '</div>';
+    return t;
+  }
+
+  $typeahead.one('focus', function() {
+    $form.addClass('loading');
+
+    $.getJSON(searchURL).then(function(searchData) {
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+      });
+
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+              var doc = searchData[result.ref];
+              doc.url = result.ref;
+              return doc;
+            });
+            sync(results);
+          }
+        }
+      );
+      $form.removeClass('loading');
+      $typeahead.trigger('focus');
+    });
+  });
+
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+
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