Why does undefined is returned when an object returns a value

Question

Trying to understand why is "undefined" returned when consoling out the output.

  var learnFn = (function(){


   var callMe = function(){
    console.log('hi');
   } 

   return {
     name:"tom",
     callMe: callMe
   }
  })();

  console.log(learnFn.callMe());

  Output:

  "hi"
  undefined

Because cosole.log() returns undefined. If you run this in the dev tools, you'd see exactly that. — VLAZ
– VLAZ, Commented Oct 23, 2016 at 16:15
@vlaz: That's not the reason. In the code above, it wouldn't matter what console.log() returns. — Michael Geary
– Michael Geary, Commented Oct 23, 2016 at 16:21
@MichaelGeary true, I didn't pay much attention to what the function was - I thought somebody was executing some code in the console and confused about undefined coming from console.log. Happens regularly enough to have fooled me. — VLAZ
– VLAZ, Commented Oct 23, 2016 at 16:24
@vlaz yes i was confused about undefined coming from console.log . Now got it, but how to get rid of it? — Godfrey Fernandes
– Godfrey Fernandes, Commented Oct 23, 2016 at 16:28
@godfreyfernandes don't log a function call that returns undefined or alternatively, do not return undefined from the function call you log the result of. — VLAZ
– VLAZ, Commented Oct 23, 2016 at 16:30

Quentin · Accepted Answer · 2016-10-23 16:16:04Z

3

The function you are calling:

var callMe = function(){
    console.log('hi');
}

… has no return statement. So it returns undefined (which you then log, after the console.log statement inside that function has run).

answered Oct 23, 2016 at 16:16

Quentin

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