What is a closure?

Closures are an extremely powerful property of JavaScript

Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created.

        let myName = "javascript";

        function printName(){

            // console.log(myName)

            document.write(myName)

        }

        myName = 'React Js'

        printName()

        myName = 'Node Js'

        printName()

Function Inside

        function numberGenerator() {

        // Local “free” variable that ends up within the closure

            var num = 1;

            function checkNumber() {

                console.log(num);

             }

             num++;

             return checkNumber;

            }

            var number = numberGenerator();

            number(); // 2