[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [mapIntersect](./rc-js-util.mapintersect.md) ## mapIntersect() function Does not check value equality, only key. Takes items from A. See [mapIntersect()](./rc-js-util.mapintersect.md). **Signature:** ```typescript export declare function mapIntersect(a: ReadonlyMap, b: ReadonlyMap): Map; ``` ## Parameters

Parameter	Type	Description
a	ReadonlyMap<TKey, TIem>
b	ReadonlyMap<TKey, TIem>

**Returns:** Map<TKey, TIem>