# debugPrint(_:separator:terminator:to:) Writes the textual representations of the given items most suitable for debugging into the given output stream. ``` func debugPrint(_ items: Any..., separator: String = " ", terminator: String = "\n", to output: inout Target) where Target : TextOutputStream ``` ## Parameters `items` Zero or more items to print. `separator` A string to print between each item. The default is a single space (`" "`). `terminator` The string to print after all items have been printed. The default is a newline (`"\n"`). `output` An output stream to receive the text representation of each item. ## Discussion You can pass zero or more items to the `debugPrint(_:separator:terminator:to:)` function. The textual representation for each item is the same as that obtained by calling `String(reflecting: item)`. The following example prints a closed range of integers to a string: ``` var range = "My range: " debugPrint(1...5, to: &range) // range == "My range: ClosedRange(1...5)\n" ``` To print the items separated by something other than a space, pass a string as `separator`. ``` var separated = "" debugPrint(1.0, 2.0, 3.0, 4.0, 5.0, separator: " ... ", to: &separated) // separated == "1.0 ... 2.0 ... 3.0 ... 4.0 ... 5.0\n" ``` The output from each call to `debugPrint(_:separator:terminator:to:)` includes a newline by default. To print the items without a trailing newline, pass an empty string as `terminator`. ``` var numbers = "" for n in 1...5 { debugPrint(n, terminator: "", to: &numbers) } // numbers == "12345" ``` --- 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)