On Sep 29, 2011, at 6:20 PM, Brendan Eich wrote: > On Sep 30, 2011, at 1:11 AM, Erik Arvidsson wrote: > >> On Thu, Sep 29, 2011 at 17:08, Bob Nystrom <[email protected]> wrote: >>> class Monster { >>> constructor(this.name, this.health) {} > > I <3 this. It beats the (public name, public health) variant in my view by > being explicit and not dragging in p-words.
I dislike it as it conflates assignment with declaration. > > > This is great, and I'm still a sections fan, but they mix badly if there are > any hints or smells of object literal data property initialiser synax. You > (Bob) dodge that by using let, Oliver used var (and IIRC Bob started with > var; so did ES4) -- however, Oliver and ES4 by fiat put data properties on > the instance, methods on the prototype. > > Separately, and a while ago, Alex pointed out that mutable prototype data > properties, e..g let attackers = []; in this Monster example, are a footgun. > People fail to shadow and mutate a shared singleton. > > So why do we need declarative syntax for data properties on the prototype at > all? Data properties on prototypes are exceedingly rare and usually a bug. Agreed. If anything people want constants on "the class" --Oliver
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