Hello!
Lately, I created this in one project:
export async function* zip (...iterables) {
for (const iterators = iterables.map(each => (each[Symbol.iterator]
|| each[Symbol.asyncIterator]).apply(each)); ;) {
const all = await Promise.all(iterators.map(async each => await
each.next()));
if (all.some(each => each.done)) break;
yield all.map(each => each.value);
}
}
It was sync generator before, but once one of the entries became async
generator, I changed the zip itself to be async.
My question is to the pretty ugly
const iterators = iterables.map(each => (each[Symbol.iterator] ||
each[Symbol.asyncIterator]).apply(each))
Is there some more idiomatic way to find "any iterator; sync or async" /
alternatively, could sync iterator return respective [[asyncIterator]]
as well, just promisifying the result (as a sort of proto-proposal of sort)?
Or is there some easy way to change sync iterable to async iterable, so
I could change the other ones at call site?
Thanks, Herby
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