What is the purpose of a self executing function in javascript?

Question

In javascript, when would you want to use this:

(function(){
    //Bunch of code...
})();

over this:

//Bunch of code...
         


        

Answer 1

First you must visit MDN IIFE , Now some points about this

• this is Immediately Invoked Function Expression. So when your javascript file invoked from HTML this function called immediately.
• This prevents accessing variables within the IIFE idiom as well as polluting the global scope.