Error-Type Specific try/catch Blocks

Michał Wadas michalwadas at gmail.com
Fri May 13 16:43:36 UTC 2016


I can't see why would your syntax be superior to SpiderMonkey extension
except saving few characters.

Can your syntax support code like this:

async function foo() {
   try {
      throw new Error();
   } catch(e if isNativeException(e)) {
     // special handler for DOM exceptions
   } catch(e if e instanceof (await
fancyClassLoader.load('classes/SomeLibrary/UserDefinedError'))) {
      // load class asynchronously if it wasn't loaded
   }
}

?


On Fri, May 13, 2016 at 5:58 PM, Joseph Groseclose <jgrosecl49 at gmail.com>
wrote:

> I've updated the proposal. See:
> https://github.com/benderTheCrime/error-type-specific-catch-proposal#about-spidermonkey-implementation
>
> On Fri, May 13, 2016 at 11:49 AM, Joseph Groseclose <jgrosecl49 at gmail.com>
> wrote:
>
>> Nevertheless, perhaps the non-standard implementation could work
>> hand-in-hand with the proposal, where SpiderMonkey could support both
>> solutions in parallel for backward compatibility. I think that the proposed
>> solution is more expressive.
>>
>> On Fri, May 13, 2016 at 11:26 AM, Claude Pache <claude.pache at gmail.com>
>> wrote:
>>
>>> Note that SpiderMonkey has already nonstandard conditional catch clauses:
>>>
>>> ```js
>>> try {
>>>     // ...
>>> }
>>> catch (e if e instanceof TypeError) {
>>>     // ....
>>> }
>>> ```
>>>
>>> —Claude
>>>
>>>
>>> Le 13 mai 2016 à 17:06, Joseph Groseclose <jgrosecl49 at gmail.com> a
>>> écrit :
>>>
>>> I sent this proposal via
>>> http://www.ecma-international.org/memento/contribute_TC39_Royalty_Free_Task_Group.php#
>>> yesterday evening. Sharing it here now:
>>> https://github.com/benderTheCrime/error-type-specific-catch-proposal
>>>
>>>
>>> _______________________________________________
>>> es-discuss mailing list
>>> es-discuss at mozilla.org
>>> https://mail.mozilla.org/listinfo/es-discuss
>>>
>>>
>>>
>>
>
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>
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