JavaScript Array copyWithin() Method

Below is the example of the Array cocopyWithinncat() method.

  • Example:
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    <script>
        // Input array
        var array = [1, 2, 3, 4, 5, 6, 7];
      
        // placing at index position 0 the element
        // between index 3 and 6
        document.write("Array " + array.copyWithin(0, 3, 6));
    </script>

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  • Output:
    Array 4, 5, 6, 4, 5, 6, 7

The arr.copyWithin() method copies part of an array to the same array and returns it, without modifying its size i.e, copies array element of an array within the same array.

Syntax:

array.copyWithin(target, start, end)

Parameters: This method accepts three parameters as mentioned above and described below:

  • target: The index position to copy the elements to(Required).
  • start: It is optional. The index position to start copying elements from (default is 0).
  • end: It is optional. The index position to stop copying elements from (default is array.length).

Return value: It returns the modified array.



More example codes for the above method are as follows:

Program 1:

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<script>
    // Input array
    var array = [1, 2, 3, 4, 5, 6, 7];
  
    // Placing from index position 0 the
    // Element from index 4
    document.write("Array " + array.copyWithin(0, 4));
</script>

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Output:

Array 5, 6, 7, 4, 5, 6, 7

Program 2:

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<script>
    // Input array
    var array = [1, 2, 3, 4, 5, 6, 7];
  
    // Placing from index position 3
    // The element from index 0
    document.write("Array " + array.copyWithin(3));
</script>

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Output:

Array 1, 2, 3, 1, 2, 3, 4

Application: Whenever we need to copy the content of any array to the same array that time we use arr.copyWithin() element in JavaScript.

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<script>
    // Input array
    var array = [1, 2, 3, 4, 5, 6, 7];
  
    // Placing at index position 0 the
    // Element between index 4 and 5
    document.write("Array " + array.copyWithin(0, 4, 5));
</script>

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Output:

Array 5, 2, 3, 4, 5, 6, 7

Supported Browsers: The browsers supported by JavaScript Array copyWithin() method are listed below:

  • Google Chrome 45.0
  • Microsoft Edge 12.0
  • Mozilla Firefox 32.0
  • Opera 32.0
  • Safari 9

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