Playing with Options

AdvancedOptions

object OptionPlay {
  println("Welcome to the Scala worksheet")
  def someCrappyJavaService = null
  val result: Option[String] = Some("Hello")
  def someProcessingLogic(x: String) = println(s"I would execute when there is some value like $x")
  def opSomeProcessingLogic(x: String): Option[String] = { println(s"I would execute when there is some value like $x"); Some("Some String") }
  //Standard Way
  if (result != None) someProcessingLogic(result.get)
  if (result.isDefined) someProcessingLogic(result.get)

  for (res <- result) someProcessingLogic(res)

  result match {
    case None => None
    case Some(x) => someProcessingLogic(x)
  }

  // Better Way!
  result map { x => someProcessingLogic(x) }
  result foreach { x => someProcessingLogic(x) }

  result.toList
  None.isEmpty

  result.flatMap(opSomeProcessingLogic(_))

  result filter (_.size > 3) foreach (x => println(x))

  val noneResult: Option[String] = None
  noneResult filter (_.size > 3) foreach (x => println(x))

  None orElse Some(10) orElse None orElse Some(1)

  val option1 = Some(10)
  val option2 = Some(99)
  val option3 = Some("Hi")
  for {
    a <- option1
    b <- option2
    c <- option3
  } yield a + b + c

  val a: Option[Int] = Some(1)
  val b = a map (_ + 1)

  val c = a.get + 1

}