Invoking a child function from another function javascript

Question

I am trying to add an inner function to the function and invoking that child function from another function.

My function driver code is as below which i cannot modify:

const obj =  function1();
obj.method1(soemobject);

The definition for the function1() which is already present is as below:

function function1(){

}

What I want to achieve is adding a method inside function1 so that i can call it from another function:

function function1(){
    function method1(item){
       console.log(item)
}
}

The error I am getting is:

with the code chunk

function function1(){
        function method1(item){
           console.log(item)
    }
    this.method1 = method1
    }

and

with the code chunk

 function function1(){
        function method1(item){
           console.log(item)
    }
    }

What I have tried so far is:

Making it a constructive function: But as the driver code cannot be modified, this won't work as it needs to be called with a new keyword.
Tried accessing function1's properties using this keyword, no luck.

The D Merged · Accepted Answer · 2020-09-22 08:25:07Z

2

Define function1 like this:

 function function1(){
      return {
       method1: function(item){
           console.log(item)
       }
      } 
    }

The result from calling function1 is stored as obj

const obj =  function1();

method1 is called on obj

obj.method1(soemobject);

obj in this case is:

{
    method1: function(item){
        console.log(item)
    }
}

answered Sep 22, 2020 at 8:25

The D Merged

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2 Comments

krunal patel Over a year ago

These worked, Thank you. The question is I want to return an array instead of console log it? and along with method1, I also have a few more methods to invoke from the same function, will the syntax be the same? separated by ","?

The D Merged Over a year ago

You can return an array or anything from within method1. method1: function(item){ return [item] } Yes, adding another function in the returned object obj along with method1 is just the same syntax separated by, : return { method1: function(item){ console.log(item) }, method2:function(){} } If it worked, please accept the Answer:)

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