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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