gistfile1.scala

trait MyOption[A] { outer =>
  import MyOption._
  
  def fold[B](map: A => B, getOrElse: => B): B

}

object MyOption {
    
  def none[A]: MyOption[A] =
    new MyOption[A] {
      def fold[B](map: A => B, getOrElse: => B): B =
        getOrElse
    }
    
  def some[A](a: A): MyOption[A] =
    new MyOption[A] {
      def fold[B](map: A => B, getOrElse: => B): B =
        map(a)
    }
}