countdown.scala

import scala.actors.Futures._

def countdown(n: Int): Unit = if (n > 0) countdown(n-1)

def time(f: => Any) {
  val start = System.nanoTime
  f
  val elapsed = System.nanoTime - start
  val elapsedInMillis = elapsed.toDouble / 1000000
  format("Elapsed: %f ms\n", elapsedInMillis)
}

def dotimes[T](n: Int)(f: => T): Array[T] = (for (i <- 1 to n) yield f).toArray

def test() {
  time {
    val results = dotimes(2) {
      future(countdown(100000000))
    }
    results.map(f => f.apply())
  }
}

dotimes(20) {
  println("-----------")
  test()
}