[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [mapRemoveOneFromArray](./rc-js-util.mapremoveonefromarray_1.md) ## mapRemoveOneFromArray() function Used with maps that store arrays. Where an array exists for a given key the value will be removed from that array. **Signature:** ```typescript export declare function mapRemoveOneFromArray(map: WeakMap, key: TKey, value: TValue): boolean; ``` ## Parameters

Parameter	Type	Description
map	WeakMap<TKey, TValue\[\]>	The `Map` to check. May be modified.
key	TKey	The key to lookup in `map`.
value	TValue	The value to remove.

**Returns:** boolean true - If value was removed. ## Remarks See [mapRemoveOneFromArray()](./rc-js-util.mapremoveonefromarray.md).