high order function

gistfile1.scala

def mymap[A,B](xs:List[A],f: A => B): List[B] = {
  xs.map(f)
}

scala> mymap(List(1,2,3),((_:Int)*2))
res2: List[Int] = List(2, 4, 6)

scala> mymap(List(1,2,3),((_:Int).toString))
res3: List[java.lang.String] = List(1, 2, 3)