[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [mustGet](./js-utils.mustget.md) ## mustGet() function Get an element from a Map and guard against nil values. Signature: ```typescript export declare function mustGet(map: Map, key: TKey): TVal; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | map | Map<TKey, TVal> | | | key | TKey | | Returns: `TVal`