CODEWITHSUNDEEP
javascript
Rishi Meena
Rishi Meena

Reputation: 31

How to call nested function in javascript?

I have two function like this..

function a() {
  function b() {
    alert('reached');
  }
}

how i call function b() from outside of function a()..

Upvotes: 2

Views: 5953

Answers (3)

Quentin
Quentin

Reputation: 943510

In general, you can't. The point of defining a function inside another function is to scope it to that function.

The only way for b to be accessible outside of a is if (when you call a) you do something inside a to make it available outside of a.

This is usually done to create a closure, so that b could access variables from a while not making those variables public. The normal way to do this is to return b.

function a() {
  var c = 0;
  function b() {
    alert(c++);
  }
  return b;
}
var d = a();
d();
d();
d();
var e = a();
e();
e();
e();

Upvotes: 7

andrzejo
andrzejo

Reputation: 91

You can rearange your code to this

function a() {
   this.b = function() {
   alert('reached');
 }
}

now instantiate it and run:

c = new a();
c.b();

Upvotes: 4

Pramod Karandikar
Pramod Karandikar

Reputation: 5329

You will need to return the inner function call.

function a() {
  function b() {
    alert('reached');
  }
  return b();
}

And then you can call this function simply by calling function a like this:

a();

The output will be the required alert.

Upvotes: 0

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