AnirudhVyas

import scala.language.higherKinds
object TypeClasses {
  // applies to type constructors (F[_])
  trait Functor[F[_]] {
    def map[A, B](xs: F[A])(f: A => B): F[B]
  }
  implicit object ListFunctor extends Functor[List] {
    override def map[A, B](xs: List[A])(f: A => B): List[B] = xs.map(f)
  }
  implicit object OptionFunctor extends Functor[Option] {