On Jun 12, 2011, at 2:52 PM, Irakli Gozalishvili wrote:
> Here is gist I wrote before:
>
> https://gist.github.com/986487#file_implementation.js
What Function.create are you using there?
Is there a missing return statement in function extend?
>> and say how it solves the super-construct and super-method-call problems?
>
> I don't have any (in js implementable solution) for those problems, also I
> think sugar for `super` can be a separate thing. Gist contains example with
> super that behave exactly the same as in harmony proposal for classes.
super.update();
// Desugars to:
// Object.getPrototypeOf(Object.getPrototypeOf(this)).update.call(this);
That comment is wrong, or worse: it implies the wrong spec. This function code
does not want to depend on |this|, which could be rebound. You want to depend
on the [[Prototype]] of the enclosing object, or if contained in class C syntax
at the right level (not nested in arbitrary function expressions or inner
function definitions), C.prototype.[[Prototype]].
Allen worked through this idea already:
http://wiki.ecmascript.org/doku.php?id=harmony:object_initialiser_super
/be
>
>> /be
>>
>>>
>>> Thanks
>>> --
>>> Irakli Gozalishvili
>>> Web: http://www.jeditoolkit.com/
>>> Address: 29 Rue Saint-Georges, 75009 Paris, France
>>>
>>> On Tuesday, 2011-05-24 at 24:48 , Brendan Eich wrote:
>>>
>>>> On May 23, 2011, at 11:25 AM, Bob Nystrom wrote:
>>>>
>>>>> One thing I'd like the proposal to support, which it doesn't currently,
>>>>> is initializers on instance property declarations. Then you could do:
>>>>>
>>>>>> class C {
>>>>>> public _list = [];
>>>>>> }
>>>>>
>>>>> With that, you'll correctly get a new _list on each instance of C when
>>>>> it's created.
>>>>
>>>> But (we've argued, I forget where so repeating it here), this looks like
>>>> [] is evaluated once when the class declaration is evaluated. That is not
>>>> what you intend.
>>>>
>>>> Then at some point (in the last thread on this) I remembered parameter
>>>> default values, but they cover only missing parameters to the constructor.
>>>> This _list member could be private. But it has to be initialized in a body
>>>> that executes once per instantiation, which is not the class body -- it's
>>>> the constructor body.
>>>>
>>>> /be
>>>>
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>>>
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>>
>
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