On Fri, Sep 26, 2014 at 10:29 AM, Brendan Eich <bren...@mozilla.org> wrote:
> Tab Atkins Jr. wrote: > >> I don't understand how you inferred from Andrea's post that "this >> wish-fulfillment __noSuchProperty__ magic property does not have to >> handle superclass delegation.". >> > > I did not infer that from Andrea's post as his position -- rather the > reverse, because he said "I also think Proxy already gives us a way ...", > to wit the code I showed earlier. Hence my confusion about what was being > proposed that differed. > > At minimum it needs to handle >> delegating to the object's own prototype (it would be a pretty poor >> NSP if it couldn't handle methodMissing use-cases as well), and I >> don't think there's a reasonable case to stop at just one level up; >> doing so would make this very fragile to refactoring your hierarchy, >> as methods show up as missing or not depending on where they end up in >> the class hierarchy. >> > > Methinks you protest too much. Just put it below Object.prototype and get > on with life. That was the idea, anyway. > > Yes, what you propose is more flexible. Also more costly. Good luck > selling implementors! I hope Andreas will comment now. > > Out of curiosity, wouldn't Object.observe require implementors to add precisely this kind of hook into the vm anyway?
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