functor8.scala

 import cats.instances.list._
 import cats.instances.option._


  val complexContainer = List(
    List(
      Some(Map(1 -> false, 2 -> true)),
      None
    ),
    List(
      Some(Map(10 -> true, 11 -> true))
    )
  )

  type IntMap[V] = Map[Int, V]

  //there is no functor for Map. It's needed in order to create complexContainerFunctor
  implicit val mvalueFunctor = new Functor[IntMap] {
    override def map[A, B](fa: IntMap[A])(f: (A) => B): IntMap[B] = fa.mapValues(f)
  }

  implicit val complexContainerFunctor = Functor[List].compose[List].compose[Option].compose[IntMap]

  //and the complexContainerFunctor in action:
  val complexContainerWithStrings = complexContainerFunctor.map(complexContainer)(if (_) "Yes" else "No")
  println(complexContainerWithStrings)