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>