JavaScript Array copyWithin() Method
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JavaScript Array copyWithin() Method
The copyWithin() method copies array elements to another position in the array, overwriting the existing values.
Note: This method overwrites the original array.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var myNumber = [1, 2, "Three", "Four"];
//copyWithin myNumber array
result = myNumber.copyWithin(2, 0, 1);
document.write(result);
</script>
</body>
</html>
Syntax
Array.copyWithin(target, start, end)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| target | Required | Specifies the location to replace the item with copied item. If target is set to positive index value, then target will be counted from left to right. If target is set to negative index value, then target will be counted from right to left. If target is set to the index value which is greater than the array length, then no effect will take place. |
| start | Optional | Specifies the index value from which the copy of elements should take place. If start is omitted, the default value is 0. If start is set to positive index value, then start will be counted from left to right. If start is set to negative index value, then start will be counted from right to left. |
| end | Optional | Specifies the index value to which the copy of elements should take place. If end is omitted, the default value is actual length of an array. If end is set to positive index value, then end will be counted from left to right. If end is set to negative index value, then end will be counted from right to left. |
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