# Publishers.TryRemoveDuplicates A publisher that publishes only elements that don’t match the previous element, as evaluated by a provided error-throwing closure. ``` struct TryRemoveDuplicates where Upstream : Publisher ``` ## Topics ### Creating a try-remove-duplicates publisher [`init(upstream:predicate:)`](/documentation/Combine/Publishers/TryRemoveDuplicates/init(upstream:predicate:)) Creates a publisher that publishes only elements that don’t match the previous element, as evaluated by a provided error-throwing closure. ### Declaring supporting types [`Publishers.Output`](/documentation/Combine/Publishers/Output) A publisher that publishes elements specified by a range in the sequence of published elements. ### Inspecting publisher properties [`upstream`](/documentation/Combine/Publishers/TryRemoveDuplicates/upstream) The publisher from which this publisher receives elements. [`predicate`](/documentation/Combine/Publishers/TryRemoveDuplicates/predicate) An error-throwing closure to evaluate whether two elements are equivalent, for purposes of filtering. --- 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)