# isSubset(of:) Returns a Boolean value that indicates whether every element in the receiving hash table is also present in another given hash table. ``` func isSubset(of other: NSHashTable) -> Bool ``` ## Parameters `other` The hash table with which to compare the receiving hash table. ## Return Value if every element in the receiving hash table is also present in `other`, otherwise . ## Discussion The equality test used for members depends on the personality option selected. For instance, choosing the [`objectPersonality`](/documentation/Foundation/NSPointerFunctions/Options/objectPersonality) option will use `isEqual:` to determine equality. See [`NSPointerFunctions.Options`](/documentation/Foundation/NSPointerFunctions/Options) for more information on personality options and their corresponding equality tests. --- 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)