Using timeThis

gistfile1.scala

val n = 40
// Measure in milliseconds how long it takes to compute a Fibonacci sequence.
timeThis(msecs){
  println ("Naive recursion fib of " + n + ": " + fib(n))
}

// Measure in nanoseconds how long it takes to compute a Fibonacci sequence.
timeThis(nanosecs){
 println ("Tail recursion fib of " + n + ": " + fib2(n))
}

// If you don't specify a time unit, it defaults to milliseconds.
timeThis{
  println ("I am going to sleep...")
  Thread.sleep(1000)
  println("Nice to wake up")
}