# keyEnumerator() Returns an enumerator object that lets you access each key in the map table. ``` func keyEnumerator() -> NSEnumerator ``` ## Return Value An enumerator object that lets you access each key in the map table. ## Discussion The following code fragment illustrates how you might use the method. ```objc NSEnumerator *enumerator = [myMapTable keyEnumerator]; id value; while ((value = [enumerator nextObject])) { /* code that acts on the map table's keys */ } ``` ### Special Considerations It is more efficient to use the fast enumeration protocol (see [`NSFastEnumeration`](/documentation/Foundation/NSFastEnumeration)). --- 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)