[Home](./index.md) > [@essex/toolbox](./toolbox.md) > [flatMap](./toolbox.flatmap.md) ## flatMap() function Flattens a multi dimensional array Signature: ```typescript export declare function flatMap(arr: any[][]): any[]; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | arr | any\[\]\[\] | The multi-dimensional array | Returns: any\[\]