# merge(with:_:) Combines elements from this publisher with those from two other publishers, delivering an interleaved sequence of elements. ``` func merge(with b: B, _ c: C) -> Publishers.Merge3 where B : Publisher, C : Publisher, Self.Failure == B.Failure, Self.Output == B.Output, B.Failure == C.Failure, B.Output == C.Output ``` ## Parameters `b` A second publisher. `c` A third publisher. ## Return Value A publisher that emits an event when any upstream publisher emits an event. ## Discussion Use [`merge(with:_:)`](/documentation/Combine/Publisher/merge(with:_:)) 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(_:_:)-5crqg). To combine elements from multiple upstream publishers, use [`zip(_:_:)`](/documentation/Combine/Publisher/zip(_:_:)-8d7k7). In this example, as [`merge(with:_:)`](/documentation/Combine/Publisher/merge(with:_:)) receives input from the upstream publishers, it republishes the interleaved elements to the downstream: ``` let pubA = PassthroughSubject() let pubB = PassthroughSubject() let pubC = PassthroughSubject() cancellable = pubA .merge(with: pubB, pubC) .sink { print("\($0)", terminator: " " )} pubA.send(1) pubB.send(40) pubC.send(90) pubA.send(2) pubB.send(50) pubC.send(100) // Prints: "1 40 90 2 50 100" ``` 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)