Light weight of Functor & Monad in scala work

FunctorMonad.scala

case class MyFunctor[K](contextValue: K) {
   def map[T](f: K => T) : MyFunctor[T]= {
     MyFunctor( f(this.contextValue) )
  }
}

case class MyMonad[K](contextValue : K) {
  def flatMap[T](f: K => MyMonad[T]) : MyMonad[T] = {
    println(s"flatMap called: $contextValue ")
    f(this.contextValue)
  }
  def map[T](f: K => T) : MyMonad[T]= {
    //Only vanilla case
    println(s"map called : $contextValue")
    MyMonad( f(this.contextValue) )
  }

}

for { m <- MyFunctor(1) } yield {
  s"${m.toString()}:the value"
}

for {
  c <- MyMonad("yes")
  b <- MyMonad(2)
   // map is called, by must be full monad def
   // if(a ...) need impl withFilter im MyMonad
  a <- MyMonad(100)
} yield {
  println(s"$c, $b, $a")
}