Subj : Re: Another JS question
To   : netscape.public.mozilla.jseng
From : Issac Goldstand
Date : Thu May 06 2004 08:08 pm


"Brendan Eich" <brendan@meer.net> wrote in message
news:4097D27D.1050600@meer.net...
> >
> > I'm going to take a leap here and say "no".  Whether you index an object
> > using foo.bar or foo["bar"], javascript doesn't differentiate between
> > the two.  (At least, I haven't yet found anything in the spec to say
> > otherwise.)
>
> I'm not sure that was Isaac's question.  But the point remains that if
> you are passed an Array that has had only named properties added to it,
> you should enumerate it using for..in, not by indexing from 0 to length,
> because length will be 0.
>

I must be missing something here - for..in is JS syntax, right?  How does
that help me in C?

The only thing I can think of (thanks to looking closely at Sterling's
APIREF) is:

JSIDArray *jids=JS_Enumerate(cx,obj);
for (int i=0;i< jids->length;i++) {
    if (JS_IdToValue(cx,jids->vector[i],&rval)) {
        ... examine and process rval ...
    } else {
        ... handle unexpected "holes" in JSIDArray
    }
}

Or am I totally barking up the wrong tree?

  Issac

.