# isSubset(of:) Returns a Boolean value that indicates whether this set is a subset of the given set. ``` func isSubset(of other: Set) -> Bool ``` ## Parameters `other` Another set. ## Return Value `true` if the set is a subset of `other`; otherwise, `false`. ## Discussion Set *A* is a subset of another set *B* if every member of *A* is also a member of *B*. ``` let employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"] let attendees: Set = ["Alicia", "Bethany", "Diana"] print(attendees.isSubset(of: employees)) // Prints "true" ``` --- 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)