> Invocation: B.describe.call(obj) should return "BA". With your library I > would expect it to return "BBA". > > Yes, it would. That's a good tricky case. I'm not sure if extra bookkeeping > could make sense of that call, as there isn't any information as to where the > function fits in to obj's prototype chain -- or if it's part of another > prototype chain entirely. I'd like to hope that something could be figured > out, but another alternative is for super() within a direct call() or apply() > to be an error.
Another problem: What if an instance method makes a super-call? A slightly less elegant (and performant) variant of your solution that works in both of the above cases is: - Keep track (per object and method) of the object where the previous super-call (e.g. super.foo()) ended up. - Start your search either there or at |this|: look for the *second* occurrence of property "foo". [optional: optimize non-|this| case] -- Dr. Axel Rauschmayer a...@rauschma.de home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com
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