closures in js

 A closure in JavaScript is known as JavaScript closure. It makes it possible for a function to have "private" variables. 

Whenever you create a function within another function, then the inner function is closure.

This closure is usually returned so you can use the outer function’s variables at a later time.

scope in JavaScript defines what variables you have access to. There are two kinds of scope – global scope and local scope.

function f1(){

    count=0;

    return function f2(){

        

        count++;

        return count;

    }

    f2();

}

let A=f1();

console.log(A());

console.log(A());

........................................

function f1(){

    var a=7;

    function f2(){

        console.log(a);

    }

    f2();

}

f1();

//function bind togther

// with  in its lexical environment

//function with its lexical scope forms a closure.

/*

A lexical scope in JavaScript means that a 

variable defined outside a function 

can be accessible inside another 

function defined after the variable declaration

*/

....................................

function f1(){

    var a=7;

    function f2(){

        console.log(a);

    }

   return  f2;

}

var k=f1();

console.log(k);