# append(contentsOf:) Adds the specified sequence of entities to the end of this collection, in order. ``` mutating func append(contentsOf sequence: S) where S : Sequence, S.Element : Entity ``` ## Parameters `sequence` The entities to add to the collection. ## Discussion> Note: This operation can invalidate the index order of any extant entities. --- 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)