How to invoke a method again and again until it returns a `Future` value containing `None`

Question

Given a method that returns a Future like this...

def remove(id: String): Future[Option[User]] = Future {
  // removes and returns the user identifi         


        

Answer 1

Here it is:

import concurrent._, ExecutionContext.Implicits._
import java.util.concurrent.atomic._

val count = new AtomicInteger(10)

def f(s: String) = Future {
  if (count.decrementAndGet <= 0) None else Some(s)
}

Iterator continually {
  f("hello")
} takeWhile {
  Await.result(_, duration.Duration.Inf).nonEmpty
} foreach { _.map { _.map {
  println
}}

I hope it helps.