# transformingChanges(_:) Create a new ordered collection difference by mapping over this difference’s members, processing the change objects with the block provided. ``` func transformingChanges(_ block: (NSOrderedCollectionChange) -> NSOrderedCollectionChange) -> CollectionDifference ``` ## Parameters `block` A block receives an ordered collection change and returns an updated change. ## Return Value A new ordered collection difference. --- 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)