FunctorPowerExample.scala

object Main extends App {

  import cats._
  import cats.implicits._


  def power[F[_]](f: F[Int])(implicit func: Functor[F]): F[Int] = {
    f.map(x => x*x)
  }

  println(power(List(1,2,3)))
  println(power(Option(2)))
  
  // alternative syntax
   def power2[F[_] : Functor](in: F[Int]): F[Int] = {
    in.map(i => i * i)
  }

}