historically powerful also thanks to its flexibility, I think JS.next should fall in the first category: base-class constructor calls anywhere - this makes the second one possible, and also other patterns available too.
my .02 On Thu, Sep 18, 2014 at 4:36 PM, Jason Orendorff <jason.orendo...@gmail.com> wrote: > On Tue, Sep 16, 2014 at 6:48 PM, Allen Wirfs-Brock > <al...@wirfs-brock.com> wrote: > > On Sep 16, 2014, at 12:57 PM, Brendan Eich wrote: > >> Allen Wirfs-Brock wrote: > >>> We have long standing consensus on the current ES6 class design and > that includes a `super()` constructor call that can be arbitrarily placed > within the constructor body. > >> > >> I'm ok with consensus if it's real and strong. We aren't there yet, and > AFAIK we never had cow-path-based use-cases for super calls tucked into the > middle of constructors. We definitely had concerns about uninitialized > objects, and people wanted to deal with constructor called as function. But > conditional super()? I don't remember that. > > > > The ES6 max-min class and @@create instantiation proposals have always > allowed arbitrarily placed `super` calls in methods (and up until the > recent discussions) we treated class constructors as just the `constructor` > method of the class prototype. The cow path for arbitrarily placed method > super` is well paved and supports the fully generality of before, after, > and around specialization in over-riding subclass methods without requiring > additional syntactic affordance. It's a cow path that is about as old as OO > programming and is just as applicable to constructor methods as to any > other kind of method. > > I don't think this is really correct. As far as I can tell, the > established pattern is > > - languages that reveal uninitialized objects (Python, Ruby) allow > base-class constructor calls anywhere > - languages that ensure the base-class constructor is called (C#, C++, > Java) require it to be called up front > > The proposed changes make ES fall in neither category. > > -j > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss >
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