# joined() Returns the elements of this sequence of sequences, concatenated. ``` func joined() -> FlattenSequence ``` ## Return Value A flattened view of the elements of this sequence of sequences. ## Discussion In this example, an array of three ranges is flattened so that the elements of each range can be iterated in turn. ``` let ranges = [0..<3, 8..<10, 15..<17] // A for-in loop over 'ranges' accesses each range: for range in ranges { print(range) } // Prints "0..<3" // Prints "8..<10" // Prints "15..<17" // Use 'joined()' to access each element of each range: for index in ranges.joined() { print(index, terminator: " ") } // Prints: "0 1 2 8 9 15 16" ``` --- 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)