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scala> val capitals = Map("France"->"Paris", "Japan"->"Tokyo", "China"->"Beijing")
capitals: scala.collection.immutable.Map[String,String] = Map(France -> Paris, Japan -> Tokyo, China -> Beijing)

scala> capitals get "France"
res0: Option[String] = Some(Paris)

scala> capitals get "North Pole"
res1: Option[String] = None

scala> capitals get "North Pole" get
warning: there was one feature warning; re-run with -feature for details
java.util.NoSuchElementException: None.get
  at scala.None$.get(Option.scala:347)
  at scala.None$.get(Option.scala:345)
  ... 33 elided

scala> capitals get "France" get
warning: there was one feature warning; re-run with -feature for details
res3: String = Paris

scala> (capitals get "North Pole") getOrElse "Oops"
res7: String = Oops

scala> capitals get "France" getOrElse "Oops"
res8: String = Paris

def showCapital(x: Option[String]) = x match {
    case Some(s) => s
    case None => "?"
}