Subj : Re: SeaMonkey: Global properties
To   : netscape.public.mozilla.jseng
From : =?ISO-8859-1?Q?Georg_Maa=DF?= <georg@vnett.de>
Date : Thu Mar 06 2003 02:59 pm

Anatoly Kochergin wrote:
> Thank you for response.
> 
> As I understand in the first line ("a=1") a temporary object has been 
> created and then disposed. As a result we get "a" global variable of 
> Number type. It is an object - so we can do "a.a=1". But "a.a" - is not 
> an object.

The variable a does not contain a Number object but a number value. The 
element lookup operator used in the expression a.a causes the value read 
from a to be automatically casted to a temporary Number object. a.a=1 
asigns the 1 to a property a of that temporary Number object. After that 
expression this temporary Number object is discarded. This causes a.a in 
a new expression to create a new temporary Number objct, where the 
property a is undefined.

.