Next element from stream in Scala

Question

Is there a method or way to get each next element from a stream?

For example if there is a stream looking like

def natural: Stream[Long] = {
  def naturalHelper: Long => Stream[Long] = {
    n => n #:: naturalHelper(n+1)
  }
  naturalHelper(1)
}

val s = natural

I'm looking for something like s.next(), returning 2 on the first call, s.next() = 3 on the next call, and so on... without using var.

0__ · Accepted Answer · 2013-07-28 21:35:30Z

11

Make it an iterator

val s = natural.iterator
s.next()
s.next()

answered Jul 28, 2013 at 21:35

0__

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2 Comments

AmigoNico Over a year ago

Right on. And if that's the only thing you plan on doing with the Stream, you probably shouldn't be using a Stream at all, since Streams save results and will eventually eat up all of your memory.

mulya Over a year ago

I agree with @AmigoNico any method with counter inside will do the job.

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