# append(copying:) Copies the elements of a span to the end of this array. ``` mutating func append(copying newElements: Span) ``` ## Parameters `newElements` A span whose contents to copy into the array. ## Discussion If the array does not have sufficient capacity to hold enough elements, then this reallocates the array’s storage to extend its capacity, using a geometric growth rate. > Complexity: O(`newElements.count`) when amortized over many > invocations 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)