Scala Options 101

gistfile1.scala

val optionHelloWorld = Option("Hello World")
val optionNil:Option[String] = None

Option(null)

if (optionHelloWorld.isDefined) optionHelloWorld.get
if (optionNil.isEmpty) "nothing here"

if (optionHelloWorld.isDefined) optionHelloWorld.get else "nothing here"

optionHelloWorld match {
 case Some(x) => x
 case None => "nothing here"
}

optionNil match {
  case Some(x) => x
  case None => "nothing here"
}

optionHelloWorld.getOrElse("nothing here")
optionNil.getOrElse("nothing here")

optionHelloWorld.getOrElse(null)
optionHelloWorld.orNull

optionNil.getOrElse(null)
optionNil.orNull

optionHelloWorld.map(_.toLowerCase)
optionNil.map(_.toLowerCase)


optionHelloWorld.fold("nothing here"){ x =>
  x.toLowerCase
}

optionNil.fold("nothing here")(_.toLowerCase)

val list = List("Hi","you","Are","AWEsome")
list.map(_.toLowerCase)


val listWithNulls = List("Hi","you",null,"Are","AWEsome",null)
//listWithNulls.map(_.toLowerCase)

listWithNulls.map(Option(_))

listWithNulls.map(Option(_).getOrElse("").toLowerCase)

listWithNulls.map(Option(_)).flatten.map(_.toLowerCase)