Shape objects

[Cyril Auburtin]

Thanks for the replies,
Optimization was not the main concern, sorry for being confusing, I was
just reminded of that idea from the video

Of course there are languages like TS which allow this, but I think it
would be natural step for JS to integrate this.
Like said, it allows validation, enforce a structure constraint, code
editors could use this new types to give autocompletion, etc..

I don't think eslint could catch a typo in an object property

@kai_zhu: Yes, at a network level, things like GraphQL or swagger allows
dynamic validations, I was more thinking directly at a language level and
more 'statically' (even if it doesn't make sense for JS, it would open
doors for tools and editors)

Le sam. 16 juin 2018 à 14:03, kai zhu <kaizhu256 at gmail.com> a écrit :

> I wish JS had Shape objects, which would not only ease performance
> optimization for the benefit of JS engines (
> https://youtu.be/5nmpokoRaZI?t=871), but also helps for validation, like
> an interface
>
> ```js
> shape Point { x: Number, y: Number, name: String };
>
> const p = Point({x: 1, y: 2, name: 'foo'})
>
> const p = Point({x: 1, y: 2, naem: 'foo'}) // throws
> ```
>
>
> @cyril, you are thinking too low-level.  given how time-constrained most
> web-projects are, shape-validating low-level library-code is
> poor-allocation of a backend-engineer’s time, that could be better spent on
> integration-level interfaces (e.g. browser <-> server interface) where most
> of these validation painpoints occur, e.g. [1]:
>
> ```http
> // frontend-request
> POST /api/v2/createPoint
> { "x": 1, "y": 2, "naem": "foo" }
>
> // useless backend-response
> 500 Internal Server Error or TIMEOUT
>
> // better backend-response (that can be reasonably debugged)
> 400
> {
>     "message": "400 POST /api/v2/createPoint - object body must have
> property \"name\"",
>     "statusCode": 400
> }
> ```
>
> [1] shape-validate integration-level interfaces with swagger
>
> https://kaizhu256.github.io/example-esdiscuss-topic-shape-objects/assets.swgg.html
>
>
> kai zhu
> kaizhu256 at gmail.com
>
>
>
> On 16 Jun 2018, at 2:30 AM, Bob Myers <rtm at gol.com> wrote:
>
> The engines already do these optimizations.
>
>
> On Sat, Jun 16, 2018 at 1:27 PM Cyril Auburtin <cyril.auburtin at gmail.com>
> wrote:
>
>> I wish JS had Shape objects, which would not only ease performance
>> optimization for the benefit of JS engines (
>> https://youtu.be/5nmpokoRaZI?t=871), but also helps for validation, like
>> an interface
>>
>> ```js
>> shape Point { x: Number, y: Number, name: String };
>>
>> const p = Point({x: 1, y: 2, name: 'foo'})
>>
>> const p = Point({x: 1, y: 2, naem: 'foo'}) // throws
>> ```
>>
>> That object would have its properties immutable
>>
>> I think proposal-first-class-protocols (
>> https://github.com/michaelficarra/proposal-first-class-protocols/issues/27#issuecomment-386975099)
>> could more or less directly do that feature
>>
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>>
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