[Public WebGL] Re: Should WebGL's getSupportedExtensions return an array or a sequence?

Cameron McCormack [email protected]
Mon Apr 2 16:36:38 PDT 2012

Boris Zbarsky:
> The current IDL is:
>    DOMString[ ] getSupportedExtensions();
> It's not quite obvious to me where the IDL array comes from in this
> case.  In particular, I believe that needs to be defined so that the
> steps in http://dev.w3.org/2006/webapi/WebIDL/#es-array for converting
> to an ECMAScript value can work:
>     1) If V is already represented by a platform array object, then the
>        ECMAScript value is that platform array object.
>     2) Otherwise, the ECMAScript value is a newly created platform array
>        object that represents V.
> Without knowing whether the IDL array value is reused across invocations
> or created anew every time, it's impossible to make the decision step 1
> requires to be made.  Unless I'm missing something?

You are right that that would need to be defined.

> It seems to me that all the questions here would be sidestepped if this
> function returned sequence<DOMString>, but if it needs to keep returning
> an array there's a lot more behavior-defining that needs to happen.
> Again, unless I'm missing something.

I agree, I think it should just return a sequence<DOMString>, then 
you'll get a JS Array object back.

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