[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [ATypedArrayTuple](./rc-js-util.atypedarraytuple.md) > [lastIndexOf](./rc-js-util.atypedarraytuple.lastindexof.md) ## ATypedArrayTuple.lastIndexOf() method Returns the index of the last occurrence of a value in an array. **Signature:** ```typescript lastIndexOf(_searchElement: number, _fromIndex?: number): number; ``` ## Parameters

Parameter	Type	Description
\_searchElement	number	The value to locate in the array.
\_fromIndex	number	_(Optional)_ The array index at which to begin the search. If fromIndex is omitted, the search starts at index 0.

**Returns:** number