Data privacy in ES5 and ES6

 To make a variable private we have used IIFE in ES5.

//ES5

(function(){

    var c=10;

})();

console.log(c);// 'c' can't be accessible outside of the IIFE 

But in ES6 we can do this in easier way ,

{

       let a =10;

}

console.log(a);

//variable a cannot be accessed outside of the block .because they are blocked scoped.