What is the real use of closures in javascript?

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

1 Reply

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Rajeesh Menoth10y ago
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