ErrorHandlers.scala

sealed trait Option[+A]
case class Some[+A](get: A) extends Option[A]
case object None extends Option[Nothing]

sealed trait EitherError[Exception, +A]
case class RecoverableError(e: Exception)
    extends EitherError[Exception, Nothing]
case class Result[+A](value: A) extends EitherError[Exception, A]

object Option {
  def map[A, B](o: Option[A])(f: A => B): Option[B] = o match {
    case Some(value) => Some(f(value))
    case None        => None
  }
}

object EitherError {
  def map[A, B](e: EitherError[Exception, A])(
      f: A => B): EitherError[Exception, B] = e match {
    case Result(value)            => Result(f(value))
    case re @ RecoverableError(_) => re
  }
}