2011/10/7 John J Barton <[email protected]> > > > On Fri, Oct 7, 2011 at 9:16 AM, Quildreen Motta <[email protected]>wrote: > >> 2011/10/7 John J Barton <[email protected]> >> >>> >>> >>> On Fri, Oct 7, 2011 at 8:34 AM, Axel Rauschmayer <[email protected]>wrote: >>> >>>> If you do something like >>>> var fuz = Object.extend(foo, {paper:'in', shoes:'my'}); >>>> >>>> Then fuz will get all properties of Object.prototype, again, as >>>> duplicates. In the above, you are clearly most interested in what you see >>>> in >>>> the literal and those are the own properties. >>>> >>> >>> I don't understand how you can get properties as duplicates in JS. >>> I disagree, since in my example I specifically point out that fuz.bar() >>> should work. >>> >> >> You can't get duplicate properties, because keys are unique. However, >> you'll still get loads of clutter in the target object. Also, again, I'm not >> sure the majority of the use-cases would be concerned with copying the >> properties in the whole prototype chain -- that's expensive! -- and you >> could achieve the latter easily by recursively extending the object. >> > > Again I'll ask you to consider that fuz.bar() should work. That is what > extend means. How can we solve this? > > We don't need to flatten the prototype chain, we can extend it. > Object.extend(a,b) can return an object whose own properties are the own > properties of |b| on those of |a| and the prototype chain of |b| appended to > the prototype chain of |a|, dropping duplicate prototypes. >
I believe that would be solved more effectively with traits (Self traits, I haven't had the time to read JS's proposal on that yet).
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