# Publishers.ReplaceEmpty A publisher that replaces an empty stream with a provided element. ``` struct ReplaceEmpty where Upstream : Publisher ``` ## Topics ### Creating a replace empty publisher [`init(upstream:output:)`](/documentation/Combine/Publishers/ReplaceEmpty/init(upstream:output:)) Creates a publisher that replaces an empty stream with a provided element. ### Declaring supporting types [`Publishers.ReplaceEmpty.Output`](/documentation/Combine/Publishers/ReplaceEmpty/Output-swift.typealias) The kind of values published by this publisher. [`Publishers.ReplaceEmpty.Output`](/documentation/Combine/Publishers/ReplaceEmpty/Output-swift.typealias) The kind of values published by this publisher. [`Publishers.ReplaceEmpty.Failure`](/documentation/Combine/Publishers/ReplaceEmpty/Failure) The kind of errors this publisher might publish. ### Inspecting publisher properties [`upstream`](/documentation/Combine/Publishers/ReplaceEmpty/upstream) The publisher from which this publisher receives elements. [`output`](/documentation/Combine/Publishers/ReplaceEmpty/output-swift.property) The element to deliver when the upstream publisher finishes without delivering any elements. [`output`](/documentation/Combine/Publishers/ReplaceEmpty/output-swift.property) The element to deliver when the upstream publisher finishes without delivering any elements. ### Comparing publishers [`==(_:_:)`](/documentation/Combine/Publishers/ReplaceEmpty/==(_:_:)) Returns a Boolean value that indicates whether two publishers are equivalent. --- 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)