reduce(f, init); transform(f, init); init can be a function

[richytong]

Right now, init is a non-function value that I'm copying. I'd like the possibility for init to be a function. The init function would be a unary function that takes the current data payload and returns an initial value to be reduced. init can be async.

reduce(
  (a, b) => a + b,
  numbers => numbers[0],
)([1, 2, 3, 4, 5]) // 1 + 1 + 2 + 3 + 4 + 5

reduce(
  (a, b) => a + b,
  async numbers => numbers[0],
)([1, 2, 3, 4, 5]) // Promise { 1 + 1 + 2 + 3 + 4 + 5 }

this is important for issues like this

[richytong]

starting on this