javascript calling a inner function from outside

Question

This is regarding javascript closures working. I have a function inside another and I want to access this outside of the outer function. is it possible since it written here that u can achieve closure with this http://www.w3schools.com/js/js_function_closures.asp JavaScript Nested Functions All functions have access to the global scope.

In fact, in JavaScript, all functions have access to the scope "above" them.

JavaScript supports nested functions. Nested functions have access to the scope "above" them.

In this example, the inner function plus() has access to the counter variable in the parent function:

Example

function add() {
    var counter = 0;`enter code here`
    function plus() {counter += 1;}
    plus();    
    return counter; 
}

I am trying to acess plus() from outside

Some very good answers in this related post here.

RBT
– RBT

2017-10-07 23:13:17 +00:00
Commented Oct 7, 2017 at 23:13 — RBT
– RBT, Commented Oct 7, 2017 at 23:13

Teddy · Accepted Answer · 2014-08-08 08:55:45Z

4

Agree with Grim.

But if you wanna access to plus function outside, you can try this way:

function add(){
  var counter = {
      value: 0,
      plus: function(){
         return ++this.value;
      }
  };
  counter.plus();
  return counter; 
}

Hope it helps.

answered Aug 8, 2014 at 8:55

Teddy

7975 silver badges13 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Grundy Over a year ago

in OP value of counter was changed, in your - you only return value, not change value

chm-software.com Over a year ago

this in your case refers to the function counter.plus so this.value will be undefined as ther is no counter.plus.value

Teddy Over a year ago

this refer to counter, not counter.plus.

Grim... · Accepted Answer · 2014-08-08 08:47:50Z

2

You cannot. An inner function is only available within the body of the outer function.

answered Aug 8, 2014 at 8:47

Grim...

17k7 gold badges47 silver badges62 bronze badges

1 Comment

Rahul Kumar Jain Over a year ago

I got very good explanation of object oriented Javascript zipcon.net/~swhite/docs/computers/languages/object_oriented_JS/…

chm-software.com · Accepted Answer · 2014-08-08 09:16:50Z

1

I assume your target is to keep value as private property inside add and provide manipulations to it via add.plus() calls:

//define your object with a private "value" and a public modifier "plus"
var add = (function() {
  var counter = 0;
  var that = {
    plus: function() {
      return counter++; //equal to your code
    }
  }
  //your integrated first call
  that.plus();
  return that;
})();

//make a call
add.plus();

answered Aug 8, 2014 at 9:16

chm-software.com

3512 silver badges10 bronze badges

Comments

ParkerSuperstar · Accepted Answer · 2014-08-27 16:29:13Z

DEMO - Working code example.

This may be what you are looking for, especially as related to the tutorial link you provided. It is a step in the right direction.

var plus;
add();
plus();
plus();
plus();
alert(plus());

function add() {
    var counter = 0;
    plus = (function(counter) {
        return function() {counter += 1;return counter;};
    })(counter);
    plus();
}

It is a straight forward example of closure. I made plus a global variable, but alternatively add() could return the function definition of plus. I took the return value away from add() and moved it to plus(), as with this code counter will always equal 1 when add() is finished.

However, and directly from the tutorial you mentioned, the best way to achieve what they are attempting is with this code, ripped directly from their web page.

var add = (function () {
    var counter = 0;
    return function () {return counter += 1;}
})();

add();
add();
add(); // the counter is now 3

Collectives™ on Stack Overflow

javascript calling a inner function from outside

4 Answers 4

3 Comments

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

3 Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related