Return value from javascript object literel

Question

I have two file a.js and b.js, I need to return value from a.js. This is the program which I wrote, please correct it thanks!

a.js

var a = (function(){
   var some = function(aa) {
        aa + 10;
   }
   var init = function(aa) {
      some(aa);
   }
   return {
       init : init
   }
})();

b.js

console.log(a.init(5));

So what exactly is the problem? are you using nodejs, a html or ...? what doesn't work? what should be corrected? — winner_joiner
– winner_joiner, Commented Dec 16, 2018 at 13:58
Assigning a self-invoking anonymous function to a variable? Why? — kind user
– kind user, Commented Dec 16, 2018 at 13:59
You need to return something in your some function. change it to return aa + 10. also your init function, to return some( aa ) — mrReiha
– mrReiha, Commented Dec 16, 2018 at 14:04

mrReiha · Accepted Answer · 2018-12-16 14:25:09Z

1

It's a chain. three functions are calling here:

call init from b.js: a.init( 5 )
call init from a.js: init = function( aa ) { ... }
call some from a.js: some = function( aa ) { ... }

every function return undefined by default, so if u want to pass your calculated value through all of this, you need to return it in every function.

new a.js

var a = (function(){

    var some = function(aa) {
        return aa + 10;
    }

    var init = function(aa) {
       return some(aa);
    }

    return {
        init : init
    }

})();

now call your b.js file, and it will work as expected.

Update:

if you would like to get rid of those return values, you can use arrow-functions like this:

var a = (function(){

    var some = aa => aa + 10;

    var init = aa => some(aa);

    return {
        init : init
    }

})();

they will return calculated value by default ( instead of undefined ).

edited Dec 16, 2018 at 14:25

answered Dec 16, 2018 at 14:16

mrReiha

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5 Comments

Rijo Over a year ago

why I want to write three return, is there is a any short cut?

enf0rcer Over a year ago

Only if you use ES6 arrow function syntax

Rijo Over a year ago

@enf0rcer how to write short cut in es6?

mrReiha Over a year ago

@Rijo Actually, there is. but you need to use ES6 ( a.k.a. JS2 ) syntax. check updated answer.

enf0rcer Over a year ago

I see @mrReiha already updated his answer. In the above example you can actually get rid of the entire init function. just use some function directly. That will save you some extra code. No need create a wrapper function for that as you only communicate via a.init method.

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