What is the real use of closures in javascript?

Question

What is the real use of closures in javascript? can you explain the concept with a simple example.

Rajeesh Menoth · Answer

Hi JavaScript variables can belong to the local or global scope. Private variables can be made possible with closures . Javascript is asynchronous by nature. Your code can't wait. Instead you say when this happens call this function. This means that Javascript code is full of functions. Functions that are passed to other functions called by them and sometimes even returned by them to be called later. These functions often want to use some data that their defining scope has available but their caller (the browser) does not. Reference : http://programmers.stackexchange.com/questions/203507/whats-so-useful-about-closures-in-js http://www.w3schools.com/js/js_function_closures.asp