# init(_:) Creates an iterator that wraps the given closure in its `next()` method. ``` init(_ body: @escaping () -> Element?) ``` ## Parameters `body` A closure that returns an optional element. `body` is executed each time the `next()` method is called on the resulting iterator. ## Discussion The following example creates an iterator that counts up from the initial value of an integer `x` to 15: ``` var x = 7 let iterator: AnyIterator = AnyIterator { defer { x += 1 } return x < 15 ? x : nil } let a = Array(iterator) // a == [7, 8, 9, 10, 11, 12, 13, 14] ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)