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<html lang="en"><head><meta charset="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>JavaScript Environment · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta property="og:title" content="JavaScript Environment · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="## JavaScript Runtime"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://facebook.github.io/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/blog/feed.xml" title="React Native Blog RSS Feed"/><script type="text/javascript" src="https://snack.expo.io/embed.js"></script><script type="text/javascript" src="/react-native/js/codeblocks.js"></script><link rel="stylesheet" href="/react-native/css/main.css"/></head><body class="sideNavVisible"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/react-native/"><img class="logo" src="/react-native/img/header_logo.png"/><h2 class="headerTitle">React Native</h2></a><a href="/react-native/versions.html"><h3>0.26</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li><a href="/react-native/docs/0.26/getting-started.html" target="_self">Docs</a></li><li><a href="/react-native/en/help.html" target="_self">Community</a></li><li><a href="/react-native/blog" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search"/></li><li><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li><li><a href="https://reactjs.org/" target="_self">React</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><i></i></div><h2><i>›</i><span>Guides</span></h2></div><div class="navGroups"><div class="navGroup navGroupActive"><h3>The Basics</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/getting-started.html">Getting Started</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/tutorial.html">Learn the Basics</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/props.html">Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/state.html">State</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/style.html">Style</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/height-and-width.html">Height and Width</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/flexbox.html">Layout with Flexbox</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/handling-text-input.html">Handling Text Input</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/handling-touches.html">Handling Touches</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/using-a-scrollview.html">Using a ScrollView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/using-a-listview.html">Using List Views</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/network.html">Networking</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/more-resources.html">More Resources</a></li></ul></div><div class="navGroup navGroupActive"><h3>Guides</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/components-and-apis.html">Components and APIs</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/platform-specific-code.html">Platform Specific Code</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/navigation.html">Navigating Between Screens</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/images.html">Images</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/animations.html">Animations</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/accessibility.html">Accessibility</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/improvingux.html">Improving User Experience</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/timers.html">Timers</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/debugging.html">Debugging</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/performance.html">Performance</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/gesture-responder-system.html">Gesture Responder System</a></li><li class="navListItem navListItemActive"><a class="navItem navItemActive" href="/react-native/docs/0.26/javascript-environment.html">JavaScript Environment</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/direct-manipulation.html">Direct Manipulation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/colors.html">Color Reference</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/integration-with-existing-apps.html">Integration with Existing Apps</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/running-on-device.html">Running On Device</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/upgrading.html">Upgrading to new React Native versions</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/troubleshooting.html">Troubleshooting</a></li></ul></div><div class="navGroup navGroupActive"><h3>Guides (iOS)</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/native-modules-ios.html">Native Modules</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/native-components-ios.html">Native UI Components</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/linking-libraries-ios.html">Linking Libraries</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/running-on-simulator-ios.html">Running On Simulator</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/communication-ios.html">Communication between native and React Native</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/building-for-apple-tv.html">Building For TV Devices</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/app-extensions.html">App Extensions</a></li></ul></div><div class="navGroup navGroupActive"><h3>Guides (Android)</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/native-modules-android.html">Native Modules</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/native-components-android.html">Native UI Components</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/headless-js-android.html">Headless JS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/signed-apk-android.html">Generating Signed APK</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/android-building-from-source.html">Building React Native from source</a></li></ul></div><div class="navGroup navGroupActive"><h3>Contributing</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/contributing.html">How to Contribute</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/maintainers.html">What to Expect from Maintainers</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/testing.html">Testing your Changes</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/understanding-cli.html">Understanding the CLI</a></li></ul></div><div class="navGroup navGroupActive"><h3>Components</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/datepickerios.html">DatePickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/image.html">Image</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/modal.html">Modal</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/navigatorios.html">NavigatorIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/picker.html">Picker</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/pickerios.html">PickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/progressbarandroid.html">ProgressBarAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/progressviewios.html">ProgressViewIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/refreshcontrol.html">RefreshControl</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/scrollview.html">ScrollView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/segmentedcontrolios.html">SegmentedControlIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/slider.html">Slider</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/snapshotviewios.html">SnapshotViewIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/statusbar.html">StatusBar</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/switch.html">Switch</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/tabbarios.html">TabBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/tabbarios-item.html">TabBarIOS.Item</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/text.html">Text</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/textinput.html">TextInput</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/toolbarandroid.html">ToolbarAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/touchablehighlight.html">TouchableHighlight</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/touchableopacity.html">TouchableOpacity</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/viewpagerandroid.html">ViewPagerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/webview.html">WebView</a></li></ul></div><div class="navGroup navGroupActive"><h3>APIs</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/actionsheetios.html">ActionSheetIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/animated.html">Animated</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/appstate.html">AppState</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/asyncstorage.html">AsyncStorage</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/cameraroll.html">CameraRoll</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/clipboard.html">Clipboard</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/datepickerandroid.html">DatePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/dimensions.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/easing.html">Easing</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/geolocation.html">Geolocation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/imageeditor.html">ImageEditor</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/imagepickerios.html">ImagePickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/imagestore.html">ImageStore</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/image-style-props.html">Image Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/interactionmanager.html">InteractionManager</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/layout-props.html">Layout Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/layoutanimation.html">LayoutAnimation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/linking.html">Linking</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/netinfo.html">NetInfo</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/panresponder.html">PanResponder</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/pixelratio.html">PixelRatio</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/pushnotificationios.html">PushNotificationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/settings.html">Settings</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/shadow-props.html">Shadow Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/statusbarios.html">StatusBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/stylesheet.html">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/text-style-props.html">Text Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/timepickerandroid.html">TimePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/toastandroid.html">ToastAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/transforms.html">Transforms</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/vibration.html">Vibration</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/vibrationios.html">VibrationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.26/view-style-props.html">View Style Props</a></li></ul></div></div></section></div><script>
var toggler = document.getElementById('navToggler');
var nav = document.getElementById('docsNav');
toggler.onclick = function() {
nav.classList.toggle('docsSliderActive');
};
</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/javascript-environment.md" target="_blank">Edit</a><h1>JavaScript Environment</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" name="javascript-runtime"></a><a href="#javascript-runtime" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript Runtime</h2>
<p>When using React Native, you're going to be running your JavaScript code in two environments:</p>
<ul>
<li>In most cases, React Native will use <a href="http://trac.webkit.org/wiki/JavaScriptCore">JavaScriptCore</a>, the JavaScript engine that powers Safari. Note that on iOS, JavaScriptCore does not use JIT due to the absence of writable executable memory in iOS apps.</li>
<li>When using Chrome debugging, all JavaScript code runs within Chrome itself, communicating with native code via WebSockets. Chrome uses <a href="https://code.google.com/p/v8/">V8</a> as its JavaScript engine.</li>
</ul>
<p>While both environments are very similar, you may end up hitting some inconsistencies. We're likely going to experiment with other JavaScript engines in the future, so it's best to avoid relying on specifics of any runtime.</p>
<h2><a class="anchor" aria-hidden="true" name="javascript-syntax-transformers"></a><a href="#javascript-syntax-transformers" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript Syntax Transformers</h2>
<p>Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.</p>
<p>React Native ships with the <a href="https://babeljs.io">Babel JavaScript compiler</a>. Check <a href="https://babeljs.io/docs/plugins/#transform-plugins">Babel documentation</a> on its supported transformations for more details.</p>
<p>Here's a full list of React Native's <a href="https://github.com/facebook/react-native/blob/master/babel-preset/configs/main.js#L16">enabled transformations</a>.</p>
<p>ES5</p>
<ul>
<li>Reserved Words: <code>promise.catch(function() { });</code></li>
</ul>
<p>ES6</p>
<ul>
<li><a href="http://babeljs.io/docs/learn-es2015/#arrows">Arrow functions</a>: <code>&lt;C onPress={() =&gt; this.setState({pressed: true})}</code></li>
<li><a href="https://babeljs.io/docs/learn-es2015/#let-const">Block scoping</a>: <code>let greeting = 'hi';</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#default-rest-spread">Call spread</a>: <code>Math.max(...array);</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#classes">Classes</a>: <code>class C extends React.Component { render() { return &lt;View /&gt;; } }</code></li>
<li><a href="https://babeljs.io/docs/learn-es2015/#let-const">Constants</a>: <code>const answer = 42;</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#destructuring">Destructuring</a>: <code>var {isActive, style} = this.props;</code></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of">for...of</a>: <code>for (var num of [1, 2, 3]) {}</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#modules">Modules</a>: <code>import React, { Component } from 'react';</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#enhanced-object-literals">Computed Properties</a>: <code>var key = 'abc'; var obj = {[key]: 10};</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#enhanced-object-literals">Object Concise Method</a>: <code>var obj = { method() { return 10; } };</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#enhanced-object-literals">Object Short Notation</a>: <code>var name = 'vjeux'; var obj = { name };</code></li>
<li><a href="https://github.com/sebmarkbage/ecmascript-rest-spread">Rest Params</a>: <code>function(type, ...args) { }</code></li>
<li><a href="http://babeljs.io/docs/learn-es2015/#template-strings">Template Literals</a>: <code>var who = 'world'; var str = `Hello ${who}`;</code></li>
</ul>
<p>ES8</p>
<ul>
<li><a href="https://github.com/jeffmo/es-trailing-function-commas">Function Trailing Comma</a>: <code>function f(a, b, c,) { }</code></li>
<li><a href="https://github.com/tc39/ecmascript-asyncawait">Async Functions</a>: <code>async function doStuffAsync() { const foo = await doOtherStuffAsync(); }</code>;</li>
</ul>
<p>Stage 3</p>
<ul>
<li><a href="https://github.com/sebmarkbage/ecmascript-rest-spread">Object Spread</a>: <code>var extended = { ...obj, a: 10 };</code></li>
</ul>
<p>Specific</p>
<ul>
<li><a href="https://reactjs.org/docs/jsx-in-depth.html">JSX</a>: <code>&lt;View style={{color: 'red'}} /&gt;</code></li>
<li><a href="http://flowtype.org/">Flow</a>: <code>function foo(x: ?number): string {}</code></li>
</ul>
<h2><a class="anchor" aria-hidden="true" name="polyfills"></a><a href="#polyfills" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Polyfills</h2>
<p>Many standards functions are also available on all the supported JavaScript runtimes.</p>
<p>Browser</p>
<ul>
<li><a href="https://developer.chrome.com/devtools/docs/console-api">console.{log, warn, error, info, trace, table}</a></li>
<li><a href="https://nodejs.org/docs/latest/api/modules.html">CommonJS require</a></li>
<li><a href="/react-native/docs/0.26/network.html#content">XMLHttpRequest, fetch</a></li>
<li><a href="/react-native/docs/0.26/timers.html#content">{set, clear}{Timeout, Interval, Immediate}, {request, cancel}AnimationFrame</a></li>
<li><a href="/react-native/docs/0.26/geolocation.html#content">navigator.geolocation</a></li>
</ul>
<p>ES6</p>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign">Object.assign</a></li>
<li>String.prototype.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith">startsWith</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith">endsWith</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat">repeat</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes">includes</a>}</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from">Array.from</a></li>
<li>Array.prototype.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find">find</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex">findIndex</a>}</li>
</ul>
<p>ES7</p>
<ul>
<li>Array.prototype.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes">includes</a>}</li>
</ul>
<p>ES8</p>
<ul>
<li>Object.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries">entries</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values">values</a>}</li>
</ul>
<p>Specific</p>
<ul>
<li><code>__DEV__</code></li>
</ul>
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