To create a String object in JavaScript, use string.constructor. A constructor returns a reference to the string function that created the instance's prototype.
Example
You can try to run the following code to create a String object with the constructor −
<html>
<head>
<title>JavaScript String constructor Method</title>
</head>
<body>
<script>
var str = new String( "This is string" );
document.write("str.constructor is:" + str.constructor);
</script>
</body>
</html>