String lastIndexOf()

lastIndexOf() searches a string and return the position. lastIndexOf() returns -1 if the substring isn't found. lastIndexOf() method does the search from the end of the string.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
    
        var stringValue = "hello world"; 
        document.writeln(stringValue.lastIndexOf("o")); //7 

       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo

An optional second argument tells where to start with.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
    
        var stringValue = "hello world"; 
        document.writeln(stringValue.lastIndexOf("o", 6)); //4 

       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo