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Improved LinkedList: init from Sequence #955

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Improved LinkedList: init from Sequence #955

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6 changes: 3 additions & 3 deletions Linked List/LinkedList.playground/Contents.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -272,12 +272,12 @@ extension LinkedList {
}
}

// MARK: - Extension to enable initialization from an Array
// MARK: - Extension to enable initialization from a Sequence
extension LinkedList {
convenience init(array: Array<T>) {
convenience init<S>(_ sequence: S) where S: Sequence, S.Element == T {
self.init()

array.forEach { append($0) }
sequence.forEach { append($0) }
}
}

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6 changes: 3 additions & 3 deletions Linked List/LinkedList.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -266,12 +266,12 @@ extension LinkedList {
}
}

// MARK: - Extension to enable initialization from an Array
// MARK: - Extension to enable initialization from a Sequence
extension LinkedList {
convenience init(array: Array<T>) {
convenience init<S>(_ sequence: S) where S: Sequence, S.Element == T {
self.init()

array.forEach { append($0) }
sequence.forEach { append($0) }
}
}

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11 changes: 11 additions & 0 deletions Linked List/Tests/LinkedListTests.swift
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Expand Up @@ -307,6 +307,17 @@ class LinkedListTest: XCTestCase {
XCTAssertEqual(nodeCount, list.count)
}

func testSequenceInitTypeInfer() {
let arrayInitInfer = LinkedList([1.0, 2.0, 3.0])

XCTAssertEqual(arrayInitInfer.count, 3)
XCTAssertEqual(arrayInitInfer.head?.value, 1.0)
XCTAssertEqual(arrayInitInfer.last?.value, 3.0)
XCTAssertEqual(arrayInitInfer[1], 2.0)
XCTAssertEqual(arrayInitInfer.removeLast(), 3.0)
XCTAssertEqual(arrayInitInfer.count, 2)
}

func testArrayLiteralInitTypeInfer() {
let arrayLiteralInitInfer: LinkedList = [1.0, 2.0, 3.0]

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