JavaScript Array copyWithin()
Examples
Copy to index 2, all elements from index 0:
const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.copyWithin(2, 0);
Try it Yourself »
Copy to index 2, the elements from index 0 to 2:
const fruits = ["Banana", "Orange", "Apple", "Mango", "Kiwi"];
fruits.copyWithin(2, 0, 2);
Try it Yourself »
Description
The copyWithin() method copies array elements to another position in an array.
The copyWithin() method overwrites the existing values.
The copyWithin() method does not add items to the array.
Syntax
array.copyWithin(target, start, end)
Parameters
| Parameter | Description |
| target | Required. The index (position) to copy the elements to. |
| start | Optional. The start index (position). Default is 0. |
| end | Optional. The end index (position). Default is the array length. |
Return Value
| Type | Description |
| Array | The changed array. |
Array Tutorials:
Browser Support
copyWithin() is an ECMAScript6 (ES6) feature.
ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |
copyWithin() is not supported in Internet Explorer.
