Some Typed Objects Confusion

Dmitry Lomov dslomov at chromium.org
Wed Aug 21 04:21:54 PDT 2013


string, boolean, object and any are all lowercase (we should fix the wiki)

FWIW, I am already working on a new version of polyfill. It is fully ES5.
Here is a pull request: https://github.com/dherman/structs.js/pull/12 -
I'll merge it soon, and work more to cover everything in the proposal.

Thanks,
Dmitry



On Wed, Aug 21, 2013 at 3:21 AM, Andrea Giammarchi <
andrea.giammarchi at gmail.com> wrote:

> 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
>>>>
>>>>
>>>
>>
>
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