Scala Function Mapping

function_mapping.scala

import scala.collection.mutable.ArrayBuffer
import scala.collection.mutable.LinkedList
import scala.collection.mutable.BitSet
import java.util.LinkedHashSet
 
object Main {
    def main(args: Array[String]): Unit = {
	    new FunctionMapping()
	}
}
class FunctionMapping {
	val list = List("a", "b", "c", "d", "e", "f", "g")
	val methods = List(map, flatMap, collect, foreach)
	
	def ulcase(s: String) = List(s.toUpperCase(), s.toLowerCase())
	
	def map(): Unit = {
		println("-"*20 + " list.map(ulcase) " + "-"*20)
		println(list.map(ulcase))
	}
	
	def flatMap(): Unit = {
		println("-"*20 + " list.flatMap(ulcase) " + "-"*20)
		println(list.flatMap(ulcase))
	}
	
	def collect(): Unit = {
		println("-"*20 + " list.collect(function) " + "-"*20)
		println(list.collect{ case "a" => "A"; case "b" => "B"; case "c" => "C"; case "d" => "D"; case "e" => "E"; case "f" => "F"; case "g" => "G" })
	}
	
	def foreach(): Unit = {
		println("-"*20 + " list.foreach(println) " + "-"*20)
		println(list.foreach(println))	
	}
	
}