simple-benchmark.scala

def bench(code: => Any, times: Int = 1) {
  val start = System.nanoTime
  for(_ <- 1 to times) code
  println(format("%.4f", (System.nanoTime - start)/1000000000.0))
}

scala> bench( 1+1 )
0.0000

scala> bench( 1+1, 10000)
0.0020

scala> bench( List("a"->"b"), 1000000 )
0.2600

scala> bench( Set("a"->"b"), 1000000 )
0.2170

scala> bench( Map("a"->"b"), 1000000 )
0.1610

scala> bench( ("a"->"b"), 1000000 )
0.0530