(with other: P) -> Publishers.Merge where P : Publisher, Self.Failure == P.Failure, Self.Output == P.Output ``` ## Parameters `other` Another publisher. ## Return Value A publisher that emits an event when either upstream publisher emits an event. ## Discussion Use [`merge(with:)`](/documentation/Combine/Publisher/merge(with:)-7fk3a) when you want to receive a new element whenever any of the upstream publishers emits an element. To receive tuples of the most-recent value from all the upstream publishers whenever any of them emit a value, use [`combineLatest(_:)`](/documentation/Combine/Publisher/combineLatest(_:)). To combine elements from multiple upstream publishers, use [`zip(_:)`](/documentation/Combine/Publisher/zip(_:)). In this example, as [`merge(with:)`](/documentation/Combine/Publisher/merge(with:)-7fk3a) receives input from either upstream publisher, it republishes it to the downstream: ``` let publisher = PassthroughSubject() let pub2 = PassthroughSubject() cancellable = publisher .merge(with: pub2) .sink { print("\($0)", terminator: " " )} publisher.send(2) pub2.send(2) publisher.send(3) pub2.send(22) publisher.send(45) pub2.send(22) publisher.send(17) // Prints: "2 2 3 22 45 22 17" ``` The merged publisher continues to emit elements until all upstream publishers finish. If an upstream publisher produces an error, the merged publisher fails with that error. --- 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)