# flatMapError(_:) Returns a new result, mapping any failure value using the given transformation and unwrapping the produced result. ``` consuming func flatMapError(_ transform: (Failure) -> Result) -> Result where NewFailure : Error ``` ## Parameters `transform` A closure that takes the failure value of the instance. ## Return Value A `Result` instance, either from the closure or the previous `.success`. --- 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)