On Wed, Oct 5, 2011 at 10:48 AM, John J Barton <johnjbar...@johnjbarton.com>wrote:
> > > On Wed, Oct 5, 2011 at 12:52 AM, Tom Van Cutsem <tomvc...@gmail.com>wrote: > >> Thanks for the feedback, John. >> >> I have to admit that at first I was also taken aback by the apparent >> complexity of the "syntax for efficient traits" strawman. Traits have many >> knobs, and require a lot of syntax to turn these knobs. >> >> Regardless of whether you'd want nice declarative syntax for traits for >> the sake of usability, for traits.js in particular, there's another >> important benefit to having some language support. When using Trait.create >> to create "tamper-proof" objects whose methods have an unspoofable >> |this|-binding, the traits.js library creates a method wrapper per method >> per instance (to bind |this| to the instance). I still need to verify how >> much overhead this actually creates, but there definitely is overhead, and I >> don't see any way to avoid it without some support from the language. >> > > Yes I sensed your anguish about this issue. However I believe experimental > measurements might surprise you. Lots of JS code involves event handlers > passed into DOM calls. I bet lots of JS code already duplicates methods and > bind |this|. Only when you have many instances will this overhead matter, > and in those cases I think you might be better off without OOP anyway. > It's been measured: https://mail.mozilla.org/pipermail/es-discuss/2010-September/011821.html
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