Suggestion: partition functions

Examples

partition

Takes a function and an iterable, returns a pair of 2 iterables.

// usage
const [evens, odds] = partition(
  n => n  % 2 === 0, // func: (x: T) => boolean
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] // iterable: Iterable<T>
)

// result
expect(Array.from(evens)).toEqual([0, 2, 4, 6, 8])
expect(Array.from(odds)).toEqual([1, 3, 5, 7, 9])

multiPartition

Takes a function and an iterable, returns an array of iterables.

// usage
const [a, b, c] = multiPartition(
  x => x % 3, // func: (x: T) => number
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] // iterable: Iterable<T>
)

// result
expect(Array.from(a)).toEqual([0, 3, 6, 9])
expect(Array.from(b)).toEqual([1, 4, 7])
expect(Array.from(c)).toEqual([2, 5, 8])

[sithmel]

Given that we see a valid use case consuming iterables one by one. I am going to adjust the code accordingly and publish a PR (I am probably going to steal your unit tests @KSXGitHub )

[KSXGitHub]

@sithmel I’ll wait. But I think you should make a pull request so we may discuss.