Subj : Re: for/in loops
To   : netscape.public.mozilla.jseng
From : Brendan Eich
Date : Wed May 12 2004 10:48 am

Alex Fritze wrote:

> Thanks for pointing me to that comment. I think I understand now how 
> args & vars end up as properties, although I still don't get how 
> enumerating them is useful - especially now that they are distinct from 
> function properties from a user perspective.


It's purely for backward compatibility.  I suspect there are very old 
scripts that use for..in to enumerate function args and vars, for simple 
JS-implemented object inspection.

/be

.