how to access variable inside the closure

Question

Can some help on to read the variables inside the closures. I know by having a function with return statement i can get the value.

var getCounter = (function () {
    var counter = 10;
    return function () {return counter;}
})();

getCounter(); produces 10

Is there any way to access or read the variable without the return function ?

You can but why do you it ? Why have you introduced closure then ? — Rayon
– Rayon, Commented Apr 7, 2016 at 6:16
@RayonDabre, Just curious about to get the value in one our test cases. Also we are following best practices to go with closures for our work. — Thillai Narayanan
– Thillai Narayanan, Commented Apr 7, 2016 at 6:19
You can certainly define it global..But value will be updated if closure manipulates it.. — Rayon
– Rayon, Commented Apr 7, 2016 at 6:20

nisar · Accepted Answer · 2016-04-07 06:24:54Z

1

var getCounter = (function () {
    this.counter = 10;
})();

console.log(counter);

or

var getCounter = (function () {
        counter = 10;
    })();

    console.log(counter);

jsfiddle

edited Apr 7, 2016 at 6:24

answered Apr 7, 2016 at 6:16

nisar

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3 Comments

Rayon Over a year ago

Well in this case, this belongs to window.. if OP wants to do it this way, then why closure ? Also note, this will fail in "use strict";

Rajan Singh Over a year ago

var getCounter = (function () { this.counter = 10; })(); This code will also produce the same result what is purpose writing return function () {return counter;} as getCounter is self-executing function where this refers to window.

nisar Over a year ago

then ...dont use closure..Its close the purpose of the closure....or simply use counter...

LazyDeveloper · Accepted Answer · 2016-04-07 06:29:50Z

0

I dont know why you need a closure here,

var getCounter = (function () {
  counter = 10;
  return counter;
})();
// As you wrote a closure it is self executed so getCounter variable has the counter value; 
var x = getCounter;

answered Apr 7, 2016 at 6:29

LazyDeveloper

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Comments

Praneeth Nidarshan · Accepted Answer · 2016-04-07 08:42:42Z

0

You can also try this,

var counter;
var getCounter = (function() {
  counter = 10;
})();

answered Apr 7, 2016 at 8:42

Praneeth Nidarshan

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