Some Typed Objects Confusion

Andrea Giammarchi andrea.giammarchi at gmail.com
Tue Aug 20 18:21:28 PDT 2013


sorry, point 3 was actually the question about point 2


On Tue, Aug 20, 2013 at 6:20 PM, Andrea Giammarchi <
andrea.giammarchi at gmail.com> wrote:

> Uhm, just a couple of extra question about that page if/when you have time:
>
>    1. string and boolean are mentioned, but nowhere in your `struct.js`
>    prolyfill code. Will string and boolean be accepted?
>    2. `Object` and `Any` are mentioned, but exported as object and any in
>    your `struct.js` prolyfill example. W
>    3. Which is the right way?
>
> The reason I am asking is to be able to create code that does absolutely
> nothing (for performance reason) but will look like the real thing so I can
> start experimenting with static structures and possibly a develop VS
> production version of an ES3 to ES5 compatible polyfill since I believe
> your code won't run anywhere except in SpiderMonkey (which is OK but it's
> not suitable for a lightweight migration to "structure like" logic)
>
> Thanks.
>
>
> On Tue, Aug 20, 2013 at 4:55 PM, Andrea Giammarchi <
> andrea.giammarchi at gmail.com> wrote:
>
>> Awesome, thanks!
>>
>>
>> On Tue, Aug 20, 2013 at 4:12 PM, David Herman <dherman at mozilla.com>wrote:
>>
>>> On Aug 20, 2013, at 1:31 PM, Andrea Giammarchi <
>>> andrea.giammarchi at gmail.com> wrote:
>>>
>>> > [In this page](
>>> http://wiki.ecmascript.org/doku.php?id=harmony:typed_objects), and in
>>> the latest meeting note too, I can read both uint8 and Uint8, as example.
>>>
>>> Bug. Fixed, thanks.
>>>
>>> > **The Question**
>>> > How is `new StructType({x:Uint32, y:Uint32})` supposes to understand
>>> the type? `instanceof Uint32` or `typeof v === "uint32"` or ... both in
>>> case of `boolean` and `string` ?
>>>
>>> Neither. It tells you that the x and y fields have typeof 'number' and
>>> that their values are constrained to be integers in the range [0, 2^32).
>>>
>>> > A bonus question would be: does anybody know when this stuff is
>>> planned to go out? Not a single beta/alpha channel is exposing anything at
>>> all so far.
>>>
>>> Nikhil Marathe and Niko Matsakis are actively working on the
>>> implementation for SpiderMonkey:
>>>
>>>     https://bugzilla.mozilla.org/show_bug.cgi?id=578700
>>>
>>> Dmitriy Lomov is actively working on updating the prollyfill to match
>>> the current API:
>>>
>>>     https://github.com/dherman/structs.js
>>>     https://github.com/dherman/structs.js/pull/12
>>>
>>> Not sure if anyone on the V8 team (which includes Dmitriy) has started
>>> implementation but I believe they're interested. Right now Dmitriy is
>>> focused on the prollyfill and spec.
>>>
>>> Dave
>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20130820/24837477/attachment.html>


More information about the es-discuss mailing list