CODEWITHSUNDEEP
javascript
user1252306
user1252306

Reputation: 85

Trying to understand the last line of code

I have this snippet of code:

(function(){
    var d = {
        sayHello: function(a){
            document.writeln("Hello "+a)
        }
    }
    this.d = d;
})();

I know that this is an IIFE, but the last line confuses me. Is it for the object d to get outside of the scope? It's used like an API that can be accessed, right?

this.d = d means that d is now a variable on the scope, ready to use?

Is there any other way to accomplish that?

Upvotes: -1

Views: 47

Answers (1)

Alnitak
Alnitak

Reputation: 340045

Since the IIFE is invoked directly with () there is no "context", so this will default (in non-ES5-strictmode) to window.

Hence the line is equivalent to:

window.d = d;

and yes, therefore exposing d into the global namespace.

You shouldn't use this method because it's not compatible with ES5 "use strict" which sets this = null in the absence of an explicit context. I would recommend something like this, instead:

var MYNAMESPACE = MYNAMESPACE || {};
MYNAMESPACE.SUBPACKAGE = (function() {
    ...
    return d;
})();

Upvotes: 3

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