Prototype object of javascript

Posted by in JavaScript category on for Beginner level | Points: 150 | Views : 8066 red flag

Prototype is used to define classes or objects in JavaScript. Classes or objects are building blocks of Object Oriented Programming.


The prototype object of javascript introduced in Javascript 1.1. In Visual Studio, you can get intellisense or its properties and methods.

Use of prototype

Prototype prebuilt simplifies the process of adding custom properties/methods to all instances of an object.  Keep the below code snippet in the html or aspx page and run it, you will notice that you will get a alert message.


<script language="javascript">

// create the prototype

function Car(cName, cModel) {

this.carName = cName;

this.carModel = cModel;



// declare another property

Car.prototype.price = 200000;


// now create a GetCarDetails function that will show the details

Car.prototype.GetCarDetails = function () {

return "Car Name:" + this.carName + " Car Model:" + this.carModel + " Car Price: " + this.price;



// now create the object of Car prototype

var oCar = new Car("Maruti Alto", "2009");


// Call the function that we created

alert(oCar.GetCarDetails() + oCar.Engine);




Price: 200000,

GetCarDetails = function ()


return "Car Name:"+this.carName+" Car Model:"+this.carModel+" Car Price: "+this.price;






Prototype offers   better performance in some browser(Firefox), and they provide better support for reflection, Intellisense and debugging.

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Full Name: Rajkumar Pauldurai
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I started my career with Asp,ms-access,sql server 7,xml.Then i updated to .net,share point server,Basics about Biztalk server

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