# CFMutableArray ``` class CFMutableArray ``` ## Overview CFMutableArray manages dynamic arrays. The basic interface for managing arrays is provided by [`CFArray`](/documentation/CoreFoundation/CFArray). CFMutableArray adds functions to modify the contents of an array. You create a mutable array object using either the [`CFArrayCreateMutable(_:_:_:)`](/documentation/CoreFoundation/CFArrayCreateMutable(_:_:_:)) or [`CFArrayCreateMutableCopy(_:_:_:)`](/documentation/CoreFoundation/CFArrayCreateMutableCopy(_:_:_:)) function. CFMutableArray provides several functions for changing the contents of an array, for example the [`CFArrayAppendValue(_:_:)`](/documentation/CoreFoundation/CFArrayAppendValue(_:_:)) and [`CFArrayInsertValueAtIndex(_:_:_:)`](/documentation/CoreFoundation/CFArrayInsertValueAtIndex(_:_:_:)) functions add values to an array and [`CFArrayRemoveValueAtIndex(_:_:)`](/documentation/CoreFoundation/CFArrayRemoveValueAtIndex(_:_:)) removes values from an array. You can also reorder the contents of an array using [`CFArrayExchangeValuesAtIndices(_:_:_:)`](/documentation/CoreFoundation/CFArrayExchangeValuesAtIndices(_:_:_:)) and [`CFArraySortValues(_:_:_:_:)`](/documentation/CoreFoundation/CFArraySortValues(_:_:_:_:)). CFMutableArray is “toll-free bridged” with its Cocoa Foundation counterpart, . This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore, in a method where you see an `NSMutableArray *` parameter, you can pass in a `CFMutableArrayRef`, and in a function where you see a `CFMutableArrayRef` parameter, you can pass in an NSMutableArray instance. This fact also applies to concrete subclasses of NSMutableArray. See [Toll-Free Bridged Types](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFDesignConcepts/Articles/tollFreeBridgedTypes.html#//apple_ref/doc/uid/TP40010677) for more information on toll-free bridging. ## Topics ### CFMutableArray Miscellaneous Functions [`CFArrayAppendArray(_:_:_:)`](/documentation/CoreFoundation/CFArrayAppendArray(_:_:_:)) Adds the values from one array to another array. [`CFArrayAppendValue(_:_:)`](/documentation/CoreFoundation/CFArrayAppendValue(_:_:)) Adds a value to an array giving it the new largest index. [`CFArrayCreateMutable(_:_:_:)`](/documentation/CoreFoundation/CFArrayCreateMutable(_:_:_:)) Creates a new empty mutable array. [`CFArrayCreateMutableCopy(_:_:_:)`](/documentation/CoreFoundation/CFArrayCreateMutableCopy(_:_:_:)) Creates a new mutable array with the values from another array. [`CFArrayExchangeValuesAtIndices(_:_:_:)`](/documentation/CoreFoundation/CFArrayExchangeValuesAtIndices(_:_:_:)) Exchanges the values at two indices of an array. [`CFArrayInsertValueAtIndex(_:_:_:)`](/documentation/CoreFoundation/CFArrayInsertValueAtIndex(_:_:_:)) Inserts a value into an array at a given index. [`CFArrayRemoveAllValues(_:)`](/documentation/CoreFoundation/CFArrayRemoveAllValues(_:)) Removes all the values from an array, making it empty. [`CFArrayRemoveValueAtIndex(_:_:)`](/documentation/CoreFoundation/CFArrayRemoveValueAtIndex(_:_:)) Removes the value at a given index from an array. [`CFArrayReplaceValues(_:_:_:_:)`](/documentation/CoreFoundation/CFArrayReplaceValues(_:_:_:_:)) Replaces a range of values in an array. [`CFArraySetValueAtIndex(_:_:_:)`](/documentation/CoreFoundation/CFArraySetValueAtIndex(_:_:_:)) Changes the value at a given index in an array. [`CFArraySortValues(_:_:_:_:)`](/documentation/CoreFoundation/CFArraySortValues(_:_:_:_:)) Sorts the values in an array using a given comparison function. ## See Also [Collections Programming Topics for Core Foundation](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFCollections/CFCollections.html#//apple_ref/doc/uid/10000124i) --- 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)