Object.prototype.get & bye bye Object.defineProperty

Andrea Giammarchi andrea.giammarchi at gmail.com
Thu Nov 29 14:09:48 PST 2012


Updated MDN:
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/defineProperty#Description

Hope it's fine, feel fere to edit/add/change that, thanks


On Thu, Nov 29, 2012 at 12:23 PM, Andrea Giammarchi <
andrea.giammarchi at gmail.com> wrote:

> I will ... but I still would like to know why other developers are using
> inheritance for this.
>
> No memory, performance, size, benefits and more verbose code, i.e.
>
> Object.defineProperty(o, p, Object.create(null, {value:{value:v}}))
>
> OR
>
> Object.defineProperty(o, p, new DefaultDescriptor(v));
>
> VS
>
> Object.defineProperty(o, p, {value:v})
>
> So, let's say I am starting evangelizing this here.
>
> br
>
>
>
> On Thu, Nov 29, 2012 at 11:16 AM, Brendan Eich <brendan at mozilla.org>wrote:
>
>> Andrea Giammarchi wrote:
>>
>>> I really don't understand what is exactly the advantage of considering
>>> inherited properties for descriptors.
>>>
>>
>> It's easy to overreact here. Don't mess with Object.prototype still
>> applies, or you will have other WTF moments.
>>
>> ES5 shipped this and browsers shipped implementations. David and others
>> use it. I don't think we can change it.
>>
>> The ES5 meta-object APIs are pretty much power-tools, with obvious
>> verbosity and usability taxes. Better (more concise and usable) veneer on
>> top has been done and should bubble up on github. This is not to excuse
>> anything, but any process (standardized de-jure or not) that releases
>> platform iterations to millions of developers will face this pain. Node.js
>> is facing it now.
>>
>> So I say doc this, evangelize it, and build better APIs on top of ES5.
>> TC39 people are tracking.
>>
>> /be
>>
>
>
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