[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [ensureArray](./js-utils.ensurearray_1.md) ## ensureArray() function Signature: ```typescript export declare function ensureArray(val: Optional>): ReadonlyArray; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | val | [Optional](./js-utils.optional.md)<ReadonlyArray<T>> | | Returns: ReadonlyArray<T>