Javascript execution error in Sublime

Question

I am learning JavaScript and this is my 1st week :)

var Module = (function () {
    // code
    var publicMethod = {};

    var privateMethod = function(someStringToBePassed) {
        debug("I love USA. "+someStringToBePassed);
    }

    publicMethod.someFunction = function() {
        privateMethod("USA is sexy");
    }
    return publicMethod;
})();

debug(Module.someFunction());

I am executing this in Sublime. I am seeing the following result.

--> I love USA. USA is sexy
--> undefined

Please explain why I am seeing undefined here.

[Finished in 0.0s]

Please tell me why I am seeing "undefined" in the results

It's because you're calling someFunction and then immediately passing the result to debug. Either remove the second debug, or replace the first debug with a return. — noahnu
– noahnu, Commented Feb 1, 2017 at 21:21

Thomas · Accepted Answer · 2017-02-01 21:25:10Z

1

You're not returning anything from someFunction. Try this:

Now someFunction returns the value of privateMethod. privateMethod returns the constructed string.

var Module = (function () {
// code
var publicMethod = {};

var privateMethod = function(someStringToBePassed) {
return "I love USA. "+someStringToBePassed;
}

publicMethod.someFunction = function() {
return privateMethod("USA is sexy");
}
return publicMethod;
})();

debug(Module.someFunction());

answered Feb 1, 2017 at 21:25

Thomas

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2 Comments

SFDC_BigDog Over a year ago

Hey Thomas, Thanks for the reply. If I replace Module.someFunction() with Module.publicMethod() or Module.publicMethod, it gives me an error. Is there any reason why I can't refer publicMethod outside

Telman Over a year ago

When your code executes, the Module object gets reference to publicMethod object, since you are returning it from the self-invocated function. So, Module have access to the properties of publicMethod object only (for your example it's only someFunction). You can find more info just searching for "javascript module pattern". some example is here - addyosmani.com/resources/essentialjsdesignpatterns/book/…

naresh kaktwan · Accepted Answer · 2017-03-06 10:12:37Z

0

var Module = (function () {
//code
   var publicMethod = {};

   var privateMethod = function(someStringToBePassed) {
        return ("I love USA. "+someStringToBePassed);
    }

    publicMethod.someFunction = function() {
      return  privateMethod("USA is sexy");
    }
    return publicMethod;
})();

var sample = Module;
console.log(sample.someFunction())

answered Mar 6, 2017 at 10:12

naresh kaktwan

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