Would this not work?

async function test(promise1, promise2, promise3) {
  const val1 = await promise1.catch(); // ignore exceptions
  const [val2, val3] = [] = await Promise.all([promise2, promise3]).catch();

  await Promise.all([promise1, promise2, promise3]); // throw to caller

  return val1 + val2 + val3;
}


On Tue, Apr 23, 2019 at 1:25 PM Aaron Silvas <aaronsilvas at gmail.com> wrote:

> https://github.com/asilvas/proposal-promise-flatten
>
> Looking for interest, and TC39 champion.
>
> The basic idea is to provide a simpler, more consistent interface, and
> easier to read code over using try/catches for async code paths. Regardless
> of which errors are handled or ignored, it's treated as nothing more than
> another input in the result, not all that dissimilar to callbacks.
>
> async function test(promise1, promise2, promise3) {
>   const [, val1] = await promise1.flatten(); // ignore exceptions
>   const [err, [val2, val3] = []] = await Promise.all([promise2, promise3]).flatten();
>
>   if (err) throw err; // throw to caller
>
>   return val1 + val2 + val3;
> }
>
>
> Original topic that spurred interest in this pattern:
> https://twitter.com/DavidWells/status/1119729914876284928
>
> Spec discussions:
> https://twitter.com/Aaron_Silvas/status/1120721934730137601
>
>
> Thanks,
>
> Aaron
> _______________________________________________
> es-discuss mailing list
> es-discuss at mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss
>
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Would this not work?

```js
async function test(promise1, promise2, promise3) {
  const val1 = await promise1.catch(); // ignore exceptions
  const [val2, val3] = [] = await Promise.all([promise2, promise3]).catch();

  await Promise.all([promise1, promise2, promise3]); // throw to caller

  return val1 + val2 + val3;
}
```