[Laszlo-user] js language question

[Adam Wolff]

this works in laszlo (swf)

var myobject = { x : 1 , y : 2 };
for( var k in myobject ){
    myobject[ k + "a" ] = 3;
}
//now myobject == { x : 1 , y : 2 , xa : 3 , ya : 3 }

will this always have the same behavior per the language spec? that is, is
enumeration of an object's keys in a for loop always a stack operation
that happens before the contents of a for loop?

A