Iterator.from: Accept non-iterable array-like inputs?

[js-choi]

Spinning this off of tc39/proposal-array-from-async#7.

Iterator.from and AsyncIterator.from were inspired by Array.from.

Array.from accepts not only iterable inputs. It also accepts non-iterable array-like inputs.

Should Iterator.from and AsyncIterator.from match Array.from and also accept non-iterable array-like inputs?

CC: @codehag, @michaelficarra, @ljharb.

#156 is slightly related to this.

[ljharb]

Yes, I think they should.

[zloirock]

Non-iterables are handled in Iterator.from as iterators and wrapped to a proxy iterator. Too many protocols for one method.

[ljharb]

The entire point of a .from method is to accept everything possible and output a "good" result.

[michaelficarra]

I think the question is confused? Iterator.from and AsyncIterator.from accept iterators, not (necessarily) iterables. I don't see the parallel with Array.from or your new async variant with regards to array-likes.

[ljharb]

ha, you're right, my bad - too many issues asking this same question :-). Iterator.from already takes iterator-likes, so it seems fine as-is.

[js-choi]

Yeah, you are right! I was a bit confused.