scala-interview1.scala

object GOption {
  def some[A](a: A): GOption[A] = new GOption[A] { 
    def cata[B](n: => B, s: A => B): B = sys.error("Implement me") 
  }
  def none[A]: GOption[A] = new GOption[A] { 
    def cata[B](n: => B, s: A => B): B = sys.error("Implement me") 
  }
}

trait GOption[+A] {
  import GOption._
  def cata[B](none: => B, some: A => B): B

  def map[B](f: A => B): GOption[B]              = sys.error("Implement me in terms of cata")
  def flatMap[B](f: A => GOption[B]): GOption[B] = sys.error("Implement me in terms of cata")
  def getOrElse[B >: A](b: => B): B              = sys.error("Implement me in terms of cata")

}