Scala variable with multiple types

Question

There is Either in scala which allow a variable to have 2 types value.

val x: Either[String, Int] = Left(\"apple\")

However, I

Answer 1

IMO the most natural way to express this is to create an ADT (Algebraic Data Type):

sealed trait Foo
final case class Bar(s: String) extends Foo
final case class Baz(i: Int) extends Foo
final case class Fizz(d: Double) extends Foo
final case class Buzz(l: List[String]) extends Foo

And now you can pattern match on Foo:

val f: Foo = ???
f match {
  case Bar(s) => // String
  case Baz(i) => // Int
  case Fizz(d) => // Double
  case Buzz(l) => // List[String]
}