split a stream in many

Question

I\'d like to know if there a elegant way to achieve something like that:

val l = Stream.from(1)

val parts = l.some_function(3)  //any number

parts.foreach(         


        

Answer 1

The only thing I can think of:

def distribute[T](n: Int)(x: Stream[T]) = (0 until n).map { p =>
  x.zipWithIndex.collect {
    case (e,i) if i % n == p => e
  }
}

It's kind of ugly because each of the sub-streams has to entirely traverse the main-stream. But I don't think you can mitigate that while preserving (apparent) immutability.

Have you thought of dispatching individual tasks to actors and having a "task-distributer" that does exactly this?