# union(_:) Returns a new range set containing the contents of both this set and the given set. ``` func union(_ other: RangeSet) -> RangeSet ``` ## Parameters `other` The range set to merge with this one. ## Return Value A new range set. --- 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)