Looping through a "function" object in javascript

Question

i have this project where i would like to merge a "function" object (in contrast to the JSON object - an object literal) with an existing object. i would want to get the "publicly visible" properties. however, when i do a for in loop, they don't show up. they don't trigger the console.log() inside. how do i get them?

//obj passed to extend() by external caller
//this is what obj it looked like when i console.log()'ed it
obj = function() {

    //skip these private ones
    var imPrivate = 'i should not be included';
    function imGetter() {}

    //i want these guys below:
    this.getter = imGetter;
    this.imPublic = "i should be included";

}

function extend(obj){
    console.log('i can see here');

    for (var key in obj) {
        console.log('you cannot see here');
    }

    //...more of our code here
}

You would either need to run that function or create an instance of it with the new operator before any of those properties were set. — Mike Christensen
– Mike Christensen, Commented Feb 14, 2012 at 16:50
actually, the obj here is just to display what i was passed to the loop (as shown in the console). the loop is part of a function we named extend, which is irrelevant to the question :) — Joseph
– Joseph, Commented Feb 14, 2012 at 16:54

Quentin · Accepted Answer · 2012-02-14 16:49:44Z

4

Those properties don't exist until you call the function.

Once you var foo = new obj(); then you will see the properties (on foo).

Alternatively, move the code that sets the properties so it is outside the function.

answered Feb 14, 2012 at 16:49

Quentin

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1 Comment

Joseph Over a year ago

perfect. now i know how an uncalled object looks like in the console! (and call it when needed to be called).

Mark Schultheiss · Accepted Answer · 2012-02-14 17:08:21Z

0

you could make it self execute:

var obj={};
(function(ns) { //skip these private ones   
    var imPrivate = 'i should not be included';

    function imGetter() {};
    //i want these guys below:  
    ns.getter = imGetter;
    ns.imPublic = "i should be included";
})(obj)
console.log('i can see here');
for (var key in obj) {
    console.log('you cannot see here '+key+" holds:"+obj[key]);
}

edited Feb 14, 2012 at 17:08

answered Feb 14, 2012 at 17:00

Mark Schultheiss

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