Why "self" is needed instead of "this" in JavaScript?

In this post, I am share the “Why self is needed instead of this in JavaScript?” and also what is the advantage of using “var self = this;”

var self = this;

In the JavaScript, “self” is a pattern to maintaining a reference to the original “this” keyword and also we can say that this is a technique to handle the events.

Right now, “self” should not be used because modern browsers provide a “self” as global variable (window.self).

Example [“self” keyword is needed instead of “this”],

var employee = function (name) {

    var self = this;

    self.username = name;

};

Stayed Informed - How do you define a class and its constructor?

Reference,

http://stackoverflow.com/questions/17163248/whats-the-advantage-of-using-var-self-this-in-knockout-js-view-models

I hope you are enjoying with this post! Please share with you friends. Thank you!!