Accessing variable from JavaScript object

Question

I have following script

<script>

var Obj = {
        purpose_1: {
            defaults: { 
                purpose:{ my_variable:"Test" } 
            },
            activity: function() {
                console.log( Obj.purpose_1.defaults.purpose.my_variable );
            }
        },

        purpose_2: {

        }
   }

   Obj.purpose_1.activity();

</script>

I am accessing my_variable and getting output Test in console from line

console.log( Obj.purpose_1.defaults.purpose.my_variable );

Is there any short cut way like

this.my_variable

to access my_variable instead of this long path

Obj.purpose_1.defaults.purpose.my_variable

Thanks.

this.defaults.purpose.my_variable would work as long as you continue to call the function the way you currently do. — nnnnnn
– nnnnnn, Commented Sep 16, 2013 at 12:34

Niccolò Campolungo · Accepted Answer · 2013-09-16 12:43:04Z

3

activity: function () {
    return function() {
        //this now refers to Obj.purpose_1.defaults.purpose
        console.log(this.my_variable);
    }.call(Obj.purpose_1.defaults.purpose);
    // call overrides the context in which the function is executed
}

Return a function bound to the context you need! Here is a sample fiddle.

See the Function.prototype.call method at MDN.

answered Sep 16, 2013 at 12:43

Niccolò Campolungo

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3 Comments

BlitZ Over a year ago

Made own sandbox... Well, nice (: +1 But do not forget to save reference to current context: var self = this before return function(){ ... }.call() will give direct access to both objects.

nnnnnn Over a year ago

Did you intend this answer as a joke? (I'm not sure whether to provide serious feedback or not.)

MD SHAHIDUL ISLAM Over a year ago

Oh great, thanks. there can be also use .call(this.defaults.purpose);

BlitZ · Accepted Answer · 2013-09-16 12:38:27Z

2

Because of javascript objects are implicitly passing by reference, you may create shortcuts for yourself like this:

activity: function() {
    var p = this.defaults.purpose; // shortcut

    console.log(p.my_variable); // property
}

answered Sep 16, 2013 at 12:38

BlitZ

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