String concat()

concat() concatenates one or more strings to another and returns the concatenated string.

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

Click to view the demo

The concat() method accepts any number of arguments:

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        var stringValue = "hello "; 
        
        var result = stringValue.concat("world", "!"); 
        
        document.writeln(result); //"hello world!" 
        document.writeln(stringValue); //"hello" 
       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo

The original string is not changed.