FunctorBasics.scala

package MoniodsFunctorMonad

object FunctorBasics {
  trait Functor[F[_]] {
    def map[T, Y](l: F[T])(f: T => Y): F[Y]
  }

  val listFunctor = new Functor[List] {
    override def map[T, Y](l: List[T])(f: T => Y): List[Y] = l.map(f)
  }

  val numbers = List(1, 2, 3, 4, 5, 6)
  val mapping = Map(
    1 -> "one",
    2 -> "two",
    3 -> "three",
    4 -> "four",
    5 -> "five",
    6 -> "six"
  )

  listFunctor.map(numbers)(_ * 2)                 //List(2, 4, 6, 8, 10, 12)
  listFunctor.map(numbers)(i => (i, mapping(i))) // List((1,one), (2,two), (3,three) ...


}