Unit Example

scala> def doTwoTimes(fn: (Int) => Unit) = {
     |   fn(1); fn(2); 
     | }
doThreeTimes: ((Int) => Unit)Unit
 
scala> doTwoTimes(println)
1
2
 
scala> def specialPrint(num: Int) = {
     |    println(">>>" + num + "<<<")
     | }
specialPrint: (Int)Unit
 
scala> doTwoTimes(specialPrint)
>>>1<<<
>>>2<<<
>>>3<<<