[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [mapFirstValue](./rc-js-util.mapfirstvalue.md) ## mapFirstValue() function Gets the first inserted value in a `Map`. **Signature:** ```typescript export declare function mapFirstValue(map: Map): V | undefined; ``` ## Parameters

Parameter	Type	Description
map	Map<K, V>

**Returns:** V \| undefined The first value in `map`, otherwise `undefined` where size 0. ## Remarks See [mapFirstValue()](./rc-js-util.mapfirstvalue.md).