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alexandru/sealed-trait-2.scala Secret

Created October 31, 2014 15:09
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sealed-trait-2.scala
sealed trait Option[+T] {
def map[U](f: T => U): Option[U] = this match {
case Some(value) => Some(f(value))
case None => None
}
}
case class Some[+T](value: T) extends Option[T]
case object None extends Option[Nothing]
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