ES6 - Boolean Property Prototype


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The prototype property allows you to add properties and methods to any object (Number, Boolean, String and Date, etc.).

Note − Prototype is a global property which is available with almost all the objects.

Use the following syntax to create a Boolean prototype.

object.prototype.name = value

Example

The following example shows how to use the prototype property to add a property to an object.

<html> 
   
   <head> 
      <title>User-defined objects</title> 
      <script type = "text/javascript"> 
         function book(title, author){  
            this.title = title;  
            this.author = author;  
         }  
      </script> 
   </head> 
   
   <body> 
      <script type = "text/javascript"> 
         var myBook = new book("Perl", "Tom");  
         book.prototype.price = null;  
         myBook.price = 100;  
         document.write("Book title is : " + myBook.title + "<br>");  
         document.write("Book author is : " + myBook.author + "<br>");  
         document.write("Book price is : " + myBook.price + "<br>");  
      </script> 
   </body>
   
</html>  

The following output is displayed on successful execution of the above code.

Book title is : Perl 
Book author is : Tom 
Book price is : 100

es6_boolean.htm

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