get names of objects which are in object

Question

I need to get name of each object which is inside of another object. this should be done in for loop like:

for (var obj1 in obj2){ // use obj1.getName }

if this is not possible (but it would be better if yes), I can use something like name property for each object in obj2. this property will store object name.

basically I dont know why obj1 is undefined when program goes through for loop.

EDIT: problem with undefined was in firebug breakpoint on for header row. it missed some code and show me undefined

Can you post a jsfiddle with the declaration of your object? Or maybe post it inside the question — Niccolò Campolungo
– Niccolò Campolungo, Commented May 29, 2013 at 12:55
If obj1 really is undefined than that's would be a really weird behaviour since the for loop is only looping through properties that actually exist. Or is it that just obj1.getName is undefined? — basilikum
– basilikum, Commented May 29, 2013 at 13:23
@basilikum it was another problem. I commented it in edited question, sorry :-) — koubin
– koubin, Commented May 29, 2013 at 13:38

Niet the Dark Absol · Accepted Answer · 2013-05-29 12:55:59Z

When iterating in a for..in loop like that, you will see obj1 is assigned to each key in sequence, which means you can get the value as obj2[obj1]. That's all there is to it, it couldn't be simpler.

chrislondon · Accepted Answer · 2013-05-29 13:06:11Z

When you want to select a dynamic key in an object you use the array notation like so:

for (var obj1 in obj2){ obj2[obj1] }

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