OOPS in javascript - DotNet Brother

Introduction

Javascript is Prototype-based programming and a style of object-oriented programming in which classes are not present. It can support oops because it support inheritance through prototyping as well as properties and methods Object oriented programming in JS know as Prototype-based programming.

a.       Creating Class in javascript

Following syntax is used for declaring class in JS

function Emp() {

            alert('Emp instantiated');

        }

Here Emp can be act as Class in JS

Body of Emp act as constructor as called as soon we create object of class.

2. Creating Objects of Emp Class

Using following syntax we can creating object of Emp class

var Emp1 = new Emp();

As soon we create object of Emp class it constructor we be called

Here above function Emp would be treated as class in JS

c.       Running the code

Alert will be shown on page load of web form.

d.      Properties of class

We can define properties of class in following way

function Emp(firstname) {

               alert('Emp instantiated');

               this.firstname = firstname;

          

        }

i)                    Passing value to properties

                                 var Emp1 = new Emp("Devesh is Emp of GENPACT INDIA");

               alert(Emp1.firstname);

      

ii)                   Snap for defining properties

iii)                Complete code

iv)                Running code

When we run the code we got alert of the string which we are passing to class of Emp.

  var Emp1 = new Emp("Devesh is Emp of GENPACT INDIA");