# isStrictSubset(of:) Returns a Boolean value that indicates whether this range set is a strict subset of the given set. ``` func isStrictSubset(of other: RangeSet) -> Bool ``` ## Parameters `other` A range set to compare against. ## Return Value `true` if this range set is a strict subset of `other`; otherwise, `false`. --- 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)