# Publishers.Filter A publisher that republishes all elements that match a provided closure. ``` struct Filter where Upstream : Publisher ``` ## Topics ### Creating a filter publisher [`init(upstream:isIncluded:)`](/documentation/Combine/Publishers/Filter/init(upstream:isIncluded:)) Creates a publisher that republishes all elements that match a provided closure. ### Filtering elements [`filter(_:)`](/documentation/Combine/Publishers/Filter/filter(_:)) [`tryFilter(_:)`](/documentation/Combine/Publishers/Filter/tryFilter(_:)) ### Declaring supporting types [`Publishers.Filter.Output`](/documentation/Combine/Publishers/Filter/Output) The kind of values published by this publisher. [`Publishers.Filter.Failure`](/documentation/Combine/Publishers/Filter/Failure) The kind of errors this publisher might publish. ### Inspecting publisher properties [`upstream`](/documentation/Combine/Publishers/Filter/upstream) The publisher from which this publisher receives elements. [`isIncluded`](/documentation/Combine/Publishers/Filter/isIncluded) A closure that indicates whether to republish an element. --- 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)