# keysOfEntries(options:passingTest:) Returns the set of keys whose corresponding value satisfies a constraint described by a block object. ``` func keysOfEntries(options opts: NSEnumerationOptions = [], passingTest predicate: (Any, Any, UnsafeMutablePointer) -> Bool) -> Set ``` ## Parameters `opts` A bit mask of enumeration options. `predicate` A block object that specifies constraints for values in the dictionary. ## Return Value The set of keys whose corresponding value satisfies `predicate`. ## See Also [`- enumerateKeysAndObjectsWithOptions:usingBlock:`](/documentation/Foundation/NSDictionary/enumerateKeysAndObjects(options:using:)) Applies a given block object to the entries of the dictionary, with options specifying how the enumeration is performed. --- 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)