"not a Date object" vs. "not an object with [[Class]] of ''Date''"

Alex Russell alex at dojotoolkit.org
Sat Oct 2 10:45:56 PDT 2010


On Oct 2, 2010, at 10:45 AM, Alex Russell wrote:

> On Oct 2, 2010, at 6:49 AM, Jorge wrote:
> 
>> On 02/10/2010, at 15:29, Brendan Eich wrote:
>>> On Sep 6, 2010, at 1:43 AM, Dmitry A. Soshnikov wrote:
>>> 
>>>> For what to create a proxy? It's only for catch-traps (yes, it may be used additionally to create a _catcher_ with "Array" [[Class]], but without additions -- i.e. if a user wants just to inherit from Array.prototype and to have all arrays' stuff -- proxies are not needed to him).
>>> 
>>> Proxies are required to update length to be one greater than index (property name-string P such that ToString(ToUint32(P)) == P and ToUint32(P) is not 2^32 - 1) when setting an indexed property. Array's magic [[Put]] is not inherited.
>> 
>> Why not simply spec an Array.create() ?
> 
> Or why not simply expose the [[Get]] and [[Set]] protocol for Array

Sorry, I meant [[Put]].

> so that it can be implemented directly by sub-classers? Having it hidden away in some  primitive property of Array is what makes prototypal extension for Arrays insufficient in the first place, right?
> 
> Regards
> 
>> -no need to redefine what an array is.
>> -no need to learn new concepts ( we're used to Object.create() already )
>> -easy to grasp, expected behaviour. 
>> -it's a 3-liner that would take no more than 3 minutes to implement in JS in any current UA.
>> -it would just need to be in the ES specs.
>> -- 
>> Jorge.
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> 
> --
> Alex Russell
> slightlyoff at google.com
> slightlyoff at chromium.org
> alex at dojotoolkit.org BE03 E88D EABB 2116 CC49 8259 CF78 E242 59C3 9723
> 
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--
Alex Russell
slightlyoff at google.com
slightlyoff at chromium.org
alex at dojotoolkit.org BE03 E88D EABB 2116 CC49 8259 CF78 E242 59C3 9723



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