rc-js-util/docs/rc-js-util.atypedarraytuple.copywithin.md

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

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[Home](./index.md) &gt; [rc-js-util](./rc-js-util.md) &gt; [ATypedArrayTuple](./rc-js-util.atypedarraytuple.md) &gt; [copyWithin](./rc-js-util.atypedarraytuple.copywithin.md)

## ATypedArrayTuple.copyWithin() method

Returns the this object after copying a section of the array identified by start and end to the same array starting at position target

**Signature:**

```typescript
copyWithin(_target: number, _start: number, _end?: number): this;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td>

\_target


</td><td>

number


</td><td>

If target is negative, it is treated as length+target where length is the length of the array.


</td></tr>
<tr><td>

\_start


</td><td>

number


</td><td>

If start is negative, it is treated as length+start. If end is negative, it is treated as length+end.


</td></tr>
<tr><td>

\_end


</td><td>

number


</td><td>

_(Optional)_ If not specified, length of the this object is used as its default value.


</td></tr>
</tbody></table>
**Returns:**

this