Which methods should be async?

[ronag]

We're working on this proposal for node streams at nodejs/node#40815

Question. What methods do we think make sense to allow async for?

List of candidates:

• map (Promise)
• filter (Promise)
• flatMap (AsyncGenerator)
• reduce (Promise)
• forEach (Promise)
• some (Promise)
• every (Promise)

[benjamingr]

All of them according to the spec text if I am reading it correctly - though I think for flatMap it would make sense to also take another stream (though really, that is transparent given streams are async iterable).

[Jack-Works]

what about .toAsync() to convert a sync iterator to async?

[benjamingr]

@Jack-Works as sugar for (async function*() { yield* gen; })().?

[Jamesernator]

@Jack-Works as sugar for (async function*() { yield* gen; })().?

The spec does have AsyncIterator.from for this purpose, although would it be more desirable to have it as a method as well/in place of?

[michaelficarra]

All of these methods are currently on %AsyncIterator.prototype%, and should be. As for the AsyncIterator.from shorthand question, see #160.