I think there would be a couple of differences between a noop-handler and a
forwarder-to-an-empty-object.
For one: defining a property on a forwarder-to-an-empty-object would
actually define the property on the empty object. AIUI, the noop handler
would silently absorb the assignment. Fixing would also be very different. I
think forwarding-to-an-empty-object would probably lead to the most
intuitive behavior. toString() would also work as expected when forwarding
to an empty object.
One could define a helper function along the lines of:
Proxy.createEmptyHandler = function(proto) {
proto = proto || null; // maybe the default should be Object.prototype so
that toString() works as expected
return new Proxy.Handler(Object.create(proto));
}
I'm not sure whether this is sufficiently convenient to be worth
standardizing though.
2011/1/22 Dave Herman <dher...@mozilla.com>
> Not sure; I'll think about it. Though abstracting
> Proxy.Handler(Object.create(null, {})) might in fact be a worthwhile
> convenience.
>
> Dave
>
> "Mark S. Miller" <erig...@google.com> wrote:
>
> >On Fri, Jan 21, 2011 at 2:45 PM, David Herman <dher...@mozilla.com>
> >wrote:
> >
> >> > Should we have a no-op or "sink" standard handler too?
> >>
> >> I think so, yes. Especially since you can use that to build one up
> >that
> >> implements just the other traps you want to implement, and let the
> >others
> >> "fail soft."
> >>
> >
> >How would it be different from
> >
> > new Proxy.Handler(Object.create(null, {}))
> >
> >?
> >
> >Or, depending on how soft you want to fail
> >
> > new Proxy.Handler(null)
> >
> >?
> >
> >If there is a useful difference, I have no objection.
> >
> >
> >>
> >> Dave
> >>
> >>
> >
> >
> >--
> > Cheers,
> > --MarkM
>
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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>
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