# Publishers.FirstWhere A publisher that only publishes the first element of a stream to satisfy a predicate closure. ``` struct FirstWhere where Upstream : Publisher ``` ## Topics ### Creating a first-where publisher [`init(upstream:predicate:)`](/documentation/Combine/Publishers/FirstWhere/init(upstream:predicate:)) ### Declaring supporting types [`Publishers.FirstWhere.Output`](/documentation/Combine/Publishers/FirstWhere/Output) The kind of values published by this publisher. [`Publishers.FirstWhere.Failure`](/documentation/Combine/Publishers/FirstWhere/Failure) The kind of errors this publisher might publish. ### Inspecting publisher properties [`upstream`](/documentation/Combine/Publishers/FirstWhere/upstream) The publisher from which this publisher receives elements. [`predicate`](/documentation/Combine/Publishers/FirstWhere/predicate) The closure that determines whether to publish 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)