How to call a function within another function in javascript

Question

I have created nested function in one script file A.js, like below:

function A(){
   function B(){}
}

If I want to call function B() in another script file C.js, what should I do?

Is there any reason for the nested function? Is there anything else in function A, or is it just function B? — Andy
– Andy, Commented Aug 22, 2015 at 13:56
How you would do that depends on many other things. There is no one right answer. — Pointy
– Pointy, Commented Aug 22, 2015 at 13:57
You can't, you cannot access another function's scope, unless you expose it. — Ignacio Lago
– Ignacio Lago, Commented Aug 22, 2015 at 13:58
This is like a function closure. You need to somehow return B from A(). Longer answer coming up! — Noble Mushtak
– Noble Mushtak, Commented Aug 22, 2015 at 14:00

Noble Mushtak · Accepted Answer · 2015-08-22 14:03:37Z

1

What you want to do seems to be to create a function closure of B using the variables within A(). You can then access this closure B if you return B after you call A(). Then, in C.js, you can access B by calling A and using the return value:

A.js:

function A([parameters]) {
    [variables]
    function B() { [function body] }
    //Return B from A:
    return B;
}

C.js:

//Get B:
var bFunction = A([parameters]):
//Call bFunction:
bFunction();

answered Aug 22, 2015 at 14:03

Noble Mushtak

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1 Comment

angella1011 Over a year ago

Thank you, exactly what I need~

bicccio · Accepted Answer · 2015-08-22 14:01:51Z

0

You have to return the nested function:

function A(){
   return function B(){}
}

Then In C.js

var funB = A();
funB();

or

A()();

answered Aug 22, 2015 at 14:01

bicccio

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Comments

Jijo John · Accepted Answer · 2015-08-22 14:28:13Z

0

You have to return the nested function B() from the parent function A().

Your code

function A(){
   function B(){}
}

Updated Code with return statement

function A(){
    return function B(){ //return added

 }     
 }

You can access the child function by adding an additional () Parentheses to the function call like the below example.

A()();

answered Aug 22, 2015 at 14:28

Jijo John

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