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TypedArray copyWithin() JavaScript JS

The Javascript TypedArray copyWithin() method is used to copy a portion of an array to another location in the same array and returns the size without modification.

Syntax:

arr.copyWithin(target)  
arr.copyWithin(target, start)  
arr.copyWithin(target, start, end)  

Parameters:
target: It represents the index position at which elements to be copied.
start: It represents the index position from where elements are started copying.
end: It represents the index position to which elements have to be copied.

Returns:
Size of the array without modification.

Example 1:

<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">  
var set = [11,22,33,44,55,66,77,88,99,110];   
set.copyWithin(4)  
document.write(set);  
</script>
</body>
</html>

Output:

11,22,33,44,11,22,33,44,55,66

Example 2:

<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">  
const testArray = new Uint8Array([ 11,32, 73, 24, 15, 56, 27, 18 ]);
 
testArray.copyWithin(4, 1, 3);
 
document.write(testArray);
 
</script>
</body>
</html>

Output:

11,32,73,24,32,73,27,18
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