object Main extends App {
override def main(args: Array[String]) {
 
// We start with creating some examples:
val definedInt:   Option[Int] = Some(3)
val undefinedInt: Option[Int] = None
 
def double(i: Int): Option[Int] = Option(2 * i)
 
// Now let's get create String for each number or "empty" if there is no Int:
val definedStr:   String =
  definedInt.map(_.toString).getOrElse("empty") // "3"
val undefinedStr: String =
  undefinedInt.map(_.toString).getOrElse("empty") // "empty"
 
// Let's try to execute some code only if value is not empty:
for (i <- definedInt) {
  println(i) // prints "3"
}
for (i <- undefinedInt) {
  println(i) // never called
}
 
 
}
}

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