Add function “drop” for discarding elements from a sequence.

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) }
+}

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] )
+	}
 }