# joined(separator:) Returns a new string by concatenating the elements of the sequence, adding the given separator between each element. ``` func joined(separator: String = "") -> String ``` ## Parameters `separator` A string to insert between each of the elements in this sequence. The default separator is an empty string. ## Return Value A single, concatenated string. ## Discussion The following example shows how an array of strings can be joined to a single, comma-separated string: ``` let cast = ["Vivien", "Marlon", "Kim", "Karl"] let list = cast.joined(separator: ", ") print(list) // Prints "Vivien, Marlon, Kim, Karl" ``` --- 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)