Splitby

This would be a function that would split one iterable in two, depending on a condition.

const [first, second] = splitBy((item) => item === ' ', 'hello world')
Array.from(first) // ['h', 'e', 'l', 'l', 'o']
Array.from(second) // [' ', 'w', 'o', 'r', 'l', 'd']

^^^ I am undecided about the separator

It should be an optimised version of:

const [clone1, clone2] = fork('hello world')
const first = takeWhile((item) => item !== ' ', clone1)
const second = dropWhile((item) => item !== ' ', clone2)

[conartist6]

So… ? I’m not saying we copy the API exactly, I’m just saying we use the basics of how it works.

[conartist6]

What if we just called it split and it removed the sentinel item and emitted a fully variable number of iterables? Then it would be the iterable equivalent of String.prototype.split.