JavaScript Array copyWithin() method

The JavaScript array copyWithin() method copies the part of the given array with its own elements and returns the modified array. This method doesn’t change the length of the modified array.

Syntax

The copyWithin() method is represented by the following syntax:

Parameter

target – The position where the copied element takes place.

start – It is optional. It represents the index from where the method starts copying elements. By default, it is 0.

end – It is optional. It represents the index at which elements stops copying. By default, it is array.length-1.

Return

The modified array.

JavaScript Array copyWithin() method example

Let’s see some examples of copyWithin() method.

Example 1

Here, we will pass the target, start and end index with the method.

Test it Now

Output:

Node.js,Node.js,JQuery,Bootstrap  

Example 2

Let’s see one more example where we will copy two elements.

Test it Now

Output:

Node.js,JQuery,JQuery,Bootstrap  

Example 3

In this example, we will provide only the target index and start index.

Test it Now

Output:

AngularJS,JQuery,Bootstrap,Bootstrap  

Example 4

In this example, we will provide target index only.

Test it Now

Output:

AngularJS,Node.js,AngularJS,Node.js