(_ other: P) -> Publishers.CombineLatest where P : Publisher, Self.Failure == P.Failure ``` ## Parameters `other` Another publisher to combine with this one. ## Return Value A publisher that receives and combines elements from this and another publisher. ## Discussion Use [`combineLatest(_:)`](/documentation/Combine/Publisher/combineLatest(_:)) when you want the downstream subscriber to receive a tuple of the most-recent element from multiple publishers when any of them emit a value. To pair elements from multiple publishers, use [`zip(_:)`](/documentation/Combine/Publisher/zip(_:)) instead. To receive just the most-recent element from multiple publishers rather than tuples, use [`merge(with:)`](/documentation/Combine/Publisher/merge(with:)-7qt71). > Tip: The combined publisher doesn’t produce elements until each of its upstream publishers publishes at least one element. The combined publisher passes through any requests to *all* upstream publishers. However, it still obeys the demand-fulfilling rule of only sending the request amount downstream. If the demand isn’t [`unlimited`](/documentation/Combine/Subscribers/Demand/unlimited), it drops values from upstream publishers. It implements this by using a buffer size of 1 for each upstream, and holds the most-recent value in each buffer. In this example, [`PassthroughSubject`](/documentation/Combine/PassthroughSubject) `pub1` and also `pub2` emit values; as [`combineLatest(_:)`](/documentation/Combine/Publisher/combineLatest(_:)) receives input from either upstream publisher, it combines the latest value from each publisher into a tuple and publishes it. ``` let pub1 = PassthroughSubject() let pub2 = PassthroughSubject() cancellable = pub1 .combineLatest(pub2) .sink { print("Result: \($0).") } pub1.send(1) pub1.send(2) pub2.send(2) pub1.send(3) pub1.send(45) pub2.send(22) // Prints: // Result: (2, 2). // pub1 latest = 2, pub2 latest = 2 // Result: (3, 2). // pub1 latest = 3, pub2 latest = 2 // Result: (45, 2). // pub1 latest = 45, pub2 latest = 2 // Result: (45, 22). // pub1 latest = 45, pub2 latest = 22 ``` When all upstream publishers finish, this publisher finishes. If an upstream publisher never publishes a value, this publisher never finishes. --- 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)