[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [ATypedArrayTuple](./rc-js-util.atypedarraytuple.md) > [map](./rc-js-util.atypedarraytuple.map.md) ## ATypedArrayTuple.map() method Calls a defined callback function on each element of an array, and returns an array that contains the results. **Signature:** ```typescript map(_callbackfn: (value: number, index: TExtractIndexes, array: this) => number, _thisArg?: unknown): this; ``` ## Parameters

Parameter	Type	Description
\_callbackfn	(value: number, index: [TExtractIndexes](./rc-js-util.textractindexes.md)<this>, array: this) => number	A function that accepts up to three arguments. The map method calls the \_callbackfn function one time for each element in the array.
\_thisArg	unknown	_(Optional)_ An object to which the this keyword can refer in the \_callbackfn function. If \_thisArg is omitted, undefined is used as the this value.

**Returns:** this