Timing code in Scala

time.scala

// see http://stackoverflow.com/a/9160068/2576

def time[R](block: => R): R = {
  val t0 = System.nanoTime()
  val result = block    // call-by-name
  val t1 = System.nanoTime()
  println("Elapsed time: " + (t1 - t0) + "ns")
  result
}