# print(_:to:) Prints log messages for all publishing events. ``` func print(_ prefix: String = "", to stream: (any TextOutputStream)? = nil) -> Publishers.Print ``` ## Parameters `prefix` A string —- which defaults to empty -— with which to prefix all log messages. `stream` A stream for text output that receives messages, and which directs output to the console by default. A custom stream can be used to log messages to other destinations. ## Return Value A publisher that prints log messages for all publishing events. ## Discussion Use [`print(_:to:)`](/documentation/Combine/Publisher/print(_:to:)) to log messages the console. In the example below, log messages are printed on the console: ``` let integers = (1...2) cancellable = integers.publisher .print("Logged a message", to: nil) .sink { _ in } // Prints: // Logged a message: receive subscription: (1..<2) // Logged a message: request unlimited // Logged a message: receive value: (1) // Logged a message: receive finished ``` --- 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)