From c04cd0d84be9a8fc4e1fea89e645b930106a3b4e Mon Sep 17 00:00:00 2001
From: Kare Morstol <kare@nottoobadsoftware.com>
Date: Fri, 24 Oct 2014 20:26:00 +0200
Subject: [PATCH] =?UTF-8?q?Add=20function=20=E2=80=9Cdrop=E2=80=9D=20for?=
 =?UTF-8?q?=20discarding=20elements=20from=20a=20sequence.?=
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---
 SwiftShell/Pipes.swift            | 9 +++++++++
 SwiftShellTests/Pipes_Tests.swift | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/SwiftShell/Pipes.swift b/SwiftShell/Pipes.swift
index 0c29628..a1f546a 100644
--- a/SwiftShell/Pipes.swift
+++ b/SwiftShell/Pipes.swift
@@ -82,3 +82,12 @@ public func join<C : ExtensibleCollectionType, S : SequenceType where S.Generato
 public func toArray <S : SequenceType, T where S.Generator.Element == T>(sequence: S) -> [T] {
 	return Array(sequence)
 }
+
+/** Discard all elements in `tobedropped` from sequence. */
+public func drop <S: SequenceType, T: Equatable where S.Generator.Element == T>
+	(tobedropped: [T])
+	(sequence: S)
+	-> LazySequence<FilterSequenceView<S>> {
+
+	return sequence |> filter { !contains(tobedropped, $0) }
+}
diff --git a/SwiftShellTests/Pipes_Tests.swift b/SwiftShellTests/Pipes_Tests.swift
index 4d9cb02..1ce509e 100644
--- a/SwiftShellTests/Pipes_Tests.swift
+++ b/SwiftShellTests/Pipes_Tests.swift
@@ -36,4 +36,12 @@ class Pipes_Tests: XCTestCase {
 		
 		XCTAssertEqual( result, [4,1,6] )
 	}
+	
+	func testDrop () {
+		let numbers = [1,2,3,4,5,6]
+		
+		let result = numbers |> drop([2,3,5]) |> toArray 
+		
+		XCTAssertEqual( result, [1,4,6] )
+	}
 }