JavaScript TypedArray lastIndexOf() Method

The JavaScript lastIndex()of method returns the last position of a value, or it returns -1 if the value is not found.

NOTE: The string is searched from the end to the beginning, but returns the index starting from the beginning, at position 0.

The lastIndexof() method is case sensitive.

Syntax:

Parameters:

Value: The first parameter is value that is going to be searched in the array.

Start: It refers the position where to start the search. If the value is not given in the argument, the default value is the length of the array.

Return value:

Representing the index of the element where the value is found for the last time, or -1 if the value cannot be found.

Browser Support:

Chrome	Yes
Safari	Yes
Firefox	Yes
Opera

Example

JavaScript lastIndexOf() Method

<script type="text/javascript">
 // JavaScript to illustrate lastIndexOf() method
function JavaTpoint() {
    // string
    var str = 'JavaTpoint'; 
    //Finding the index of the string
    var index = str.lastIndexOf('T');
    document.write(index);
}
JavaTpoint();
// expected output: arr[Output:4]
</script>

Test it Now

Output:

Example 2

JavaScript lastIndexOf() Method

<script type="text/javascript">
 // JavaScript to illustrate lastIndexOf() method
function JavaTpoint() {
// string
 var str = 'JavaTpoint';
 //Finding the index of the string
 var index = str.lastIndexOf('s');
 document.write(index);
}
JavaTpoint();
// expected output: arr[Output:-1]
</script>

Test it Now

Output: