How to get Object key name

Question

var obj:Object = {a:"foo", b:"bar"}
obj.a // foo keya=a value='foo'
obj.b // bar keya=b value="bar"
for each (var value:Object in obj){
trace(value);
Q: How can I get key from obj liking hash?

Answer 1

var obj:Object = {a:"foo", b:"bar"}
var retValue:String;
for ( var key:* in obj)
if ( obj[key] == "foo")
retValue= key;
break;
return retValue;
(you could of course return it straight from within the loop
but thats not very good idea, so , you get the idea right?