TypedArray lastIndexof() JavaScript

The Javascript TypedArray lastIndexof() method is used to get the last position of a value. It will return -1 if the specified value is not found in the array.

Syntax:

array.lastIndexOf(value, start) 

Parameters:
value: It represents the current element’s value.
start: It represents the index position from where to start the search. Default is array size – 1.

Returns:
It returns index of the last position of the specified element. It will return -1, if specified element not found in the array.

Example 1:

<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">   
var Jewels = "DIAMOND-GOLD";
document.write(Jewels.lastIndexOf("O"));  
</script>
</body>
</html>

Output:

9

Example 2:

<!DOCTYPE html>
<html>
<body>
<script type="text/javascript"> 
const testArray = new Uint8Array([45, 67, 12, 12, 12, 11]);
 
document.write(testArray.lastIndexOf(12, 5));
document.write("</br>");
 
document.write(testArray.lastIndexOf(12, 3));
 
</script>
</body>
</html>

Output:

4
3
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