# append(contentsOf:) Adds the elements of a sequence to the end of the array. ``` mutating func append(contentsOf newElements: S) where Element == S.Element, S : Sequence ``` ## Parameters `newElements` The elements to append to the array. ## Discussion Use this method to append the elements of a sequence to the end of this array. This example appends the elements of a `Range` instance to an array of integers. ``` var numbers = [1, 2, 3, 4, 5] numbers.append(contentsOf: 10...15) print(numbers) // Prints "[1, 2, 3, 4, 5, 10, 11, 12, 13, 14, 15]" ``` > Complexity: O(*m*) on average, where *m* is the length of > `newElements`, over many calls to `append(contentsOf:)` on the same > array. --- 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)