How to return object of constructor from inside the constructor

Question

How can I return the object from constructor from inside the constructor?

 function consFunc() {
  
    this.flag = 'someFlag';
    this.pol = 'somePole';        

    }

    consFunc.prototype.foo = function(){      
     console.log(this.flag);
    }

    var obj = new consFunc();
    obj.foo();

This is how usually I make object from constructor. How can I return object from inside the constructor function so I no need to write var obj = new consFunc(); I just simply call obj.foo(); for my need, is it possible?

Not clear what you are asking. What would obj be if it isn't new consFunc();? — charlietfl
– charlietfl, Commented Nov 20, 2016 at 7:39
I am not sure how it should be, maybe I should say consFunc.foo(); i dont know — Mohsin
– Mohsin, Commented Nov 20, 2016 at 7:41

Alex Moldovan · Accepted Answer · 2016-11-20 07:51:18Z

1

If you want to have an object with a simple function on it you can simply write

var consObj = {
  flag: 'someFlag',
  pol: 'somePole',       
  foo: function() { console.log( this.flag ); }
}

consObj.foo() // 'someFlag'

answered Nov 20, 2016 at 7:51

Alex Moldovan

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5 Comments

HenryDev Over a year ago

haven't you noticed he's using prototype to add a method?? Your answer isn't helping much

Alex Moldovan Over a year ago

@HenryDev I don't think he wants a prototype, check the comment in which I asked what he actually needs

HenryDev Over a year ago

yes I'm with you, but have you seen that in the very beginning of his code he's using prototype?

Mohsin Over a year ago

No Alex I was in need of doing it with prototype

Alex Moldovan Over a year ago

I would advise against the usage of prototypes and constructor functions for situations like this. Please provide more context around your need so we can understand it better.

charlietfl · Accepted Answer · 2016-11-20 08:09:47Z

0

You could wrap your constructor in another function and return new consFunc(); from that function:

function obj() {
  function consFunc() {
    this.flag = 'someFlag';
    this.pol = 'somePole';
  }
  consFunc.prototype.foo = function () {
    console.log(this.flag);
  }      
  return new consFunc();
}
// now use it
obj().foo()

edited Nov 20, 2016 at 8:09

answered Nov 20, 2016 at 8:02

charlietfl

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Comments

petert · Accepted Answer · 2016-11-20 08:51:28Z

0

If you need some sort of singleton:

var obj = (function (){

    var flag = 'someFlag';
    var pol = 'somePole';   

    function foo(){      
        console.log(flag);
    }

    return {
      foo: foo
    };
})();

obj.foo();

answered Nov 20, 2016 at 8:51

petert

1

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