On Dec 27, 2013, at 7:27 AM, Brendan Eich wrote:
> Claude Pache wrote:
>> I agree that `constructor(...args){ return super(...args); }` is better (i.e. less surprising) when the super-class's constructor returns an other object than `this`. However, under the current state of the specification, there is at least one exception: the `Object` constructor ignores its `this` value and creates a fresh object, which is unwanted in the theoretical case you define a class extending explicitly `Object`. I guess that this case could be normalised by using a similar mechanism as `Array` and its [[ArrayInitialisationState]] internal slot?
>
> I thought Allen designed things so
>
> class C {}
>
> differed from
>
> class C extends Object {}
>
> so as in the first case to avoid (a) super calling Object and making a useless newborn; (b) C inheriting class-side properties from Object.
Exactly, see step 7 of http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-classdefinitionevaluation
Allen
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domenic at domenicdenicola.com (2014-01-06T16:27:51.328Z)
Exactly, see step 7 of http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-classdefinitionevaluation
On Dec 27, 2013, at 7:27 AM, Brendan Eich wrote: > Claude Pache wrote: >> I agree that `constructor(...args){ return super(...args); }` is better (i.e. less surprising) when the super-class's constructor returns an other object than `this`. However, under the current state of the specification, there is at least one exception: the `Object` constructor ignores its `this` value and creates a fresh object, which is unwanted in the theoretical case you define a class extending explicitly `Object`. I guess that this case could be normalised by using a similar mechanism as `Array` and its [[ArrayInitialisationState]] internal slot? > > I thought Allen designed things so > > class C {} > > differed from > > class C extends Object {} > > so as in the first case to avoid (a) super calling Object and making a useless newborn; (b) C inheriting class-side properties from Object. Exactly, see step 7 of http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-classdefinitionevaluation Allen -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20131227/8f9c577b/attachment.html>