Subj : Re: Enumerating standard class properties & methods
To   : Sterling Bates <sterlingb@bigbangmapsonco.com>
From : Brendan Eich <brendan@meer.net>
Date : Wed Dec 17 2003 10:51 am

Sterling Bates wrote:

> Just to press the point, though, none of the implementations are strictly
> equivalent to the ECMA spec.

What do you mean?

The ECMA-262 Edition 3 spec allows extensions (see Chapter 16), so don't 
count those as "non-standard".

Any deviations from explicit normative ("must", "should") specs are a 
different issue.  Those would be bugs, and we test, track, and fix them. 
   Having no spec is bad; having a spec we extend is good; flouting the 
spec is bad.  There may be a handful of cases where we depart from the 
spec for good, well-considered backward compatibility reasons.  Those 
too are different.

Enumerating objects with for..in was always meant to skip "built-in" or 
"system pre-defined" functions and other properties, enumerating only 
user-defined properties.  That's just the way JS is.  If you need to 
enumerate all properties, you'll have to do something extra.

/be

.