# zip(_:_:) Combines elements from two other publishers and delivers groups of elements as tuples. ``` func zip(_ publisher1: P, _ publisher2: Q) -> Publishers.Zip3 where P : Publisher, Q : Publisher, Self.Failure == P.Failure, P.Failure == Q.Failure ``` ## Parameters `publisher1` A second publisher. `publisher2` A third publisher. ## Return Value A publisher that emits groups of elements from the upstream publishers as tuples. ## Discussion Use [`zip(_:_:)`](/documentation/Combine/Publisher/zip(_:_:)-8d7k7) to return a new publisher that combines the elements from two additional publishers to publish a tuple to the downstream. The returned publisher waits until all three publishers have emitted an event, then delivers the oldest unconsumed event from each publisher as a tuple to the subscriber. In this example, `numbersPub`, `lettersPub` and `emojiPub` are each a [`PassthroughSubject`](/documentation/Combine/PassthroughSubject); [`zip(_:_:)`](/documentation/Combine/Publisher/zip(_:_:)-8d7k7) receives the oldest unconsumed value from each publisher and combines them into a tuple that it republishes to the downstream: ``` let numbersPub = PassthroughSubject() let lettersPub = PassthroughSubject() let emojiPub = PassthroughSubject() cancellable = numbersPub .zip(lettersPub, emojiPub) .sink { print("\($0)") } numbersPub.send(1) // numbersPub: 1 lettersPub: emojiPub: zip output: numbersPub.send(2) // numbersPub: 1,2 lettersPub: emojiPub: zip output: numbersPub.send(3) // numbersPub: 1,2,3 lettersPub: emojiPub: zip output: lettersPub.send("A") // numbersPub: 1,2,3 lettersPub: "A" emojiPub: zip output: emojiPub.send("😀") // numbersPub: 2,3 lettersPub: "A" emojiPub: "😀" zip output: (1, "A", "😀") lettersPub.send("B") // numbersPub: 2,3 lettersPub: "B" emojiPub: zip output: emojiPub.send("🥰") // numbersPub: 3 lettersPub: emojiPub: zip output: (2, "B", "🥰") // Prints: // (1, "A", "😀") // (2, "B", "🥰") ``` If any upstream publisher finishes successfully or fails with an error, so too does the zipped publisher. --- 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)