Options In Scala

scoptions.scala

enum Option[+A]:
  case Some(value: A)
  case None

  def map[B](f: A => B): Option[B] = this match
    case None        => None
    case Some(value) => Some(f(value))

  def flatMap[B](f: A => Option[B]): Option[B] = this match
    case None        => None
    case Some(value) => f(value)

  def isSome: Boolean = this match
    case None => false
    case _    => true

  def isNone: Boolean = this match
    case None => true
    case _    => false

  def getOrElse[B <: A](otherwise: B): B = this match
    case None        => otherwise
    case Some(value) => value