# sink(receiveValue:) Attaches a subscriber with closure-based behavior to a publisher that never fails. ``` func sink(receiveValue: @escaping (Self.Output) -> Void) -> AnyCancellable ``` ## Parameters `receiveValue` The closure to execute on receipt of a value. ## Return Value A cancellable instance, which you use when you end assignment of the received value. Deallocation of the result will tear down the subscription stream. ## Discussion Use [`sink(receiveValue:)`](/documentation/Combine/Publisher/sink(receiveValue:)) to observe values received by the publisher and print them to the console. This operator can only be used when the stream doesn’t fail, that is, when the publisher’s [`Failure`](/documentation/Combine/Publisher/Failure) type is . In this example, a publisher publishes integers to a [`sink(receiveValue:)`](/documentation/Combine/Publisher/sink(receiveValue:)) operator’s `receiveValue` closure that prints them to the console: ``` let integers = (0...3) integers.publisher .sink { print("Received \($0)") } // Prints: // Received 0 // Received 1 // Received 2 // Received 3 ``` This method creates the subscriber and immediately requests an unlimited number of values, prior to returning the subscriber. The return value should be held, otherwise the stream will be canceled. --- 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)