Enum

enum.scala

trait EnumLike {
  type Value
  def value: Value
}
trait StringEnumLike extends EnumLike {
  type Value = String
}


trait EnumCompanion[A <: EnumLike] {

  def values: Seq[A]

  def valueOf(value: A#Value): Option[A] = values.find(_.value == value)

}




abstract sealed class UserType(val value: String) extends StringEnumLike
object UserType extends EnumCompanion[UserType] {
  case object Admin   extends UserType("admin")
  case object Regular extends UserType("regular")
  case object Guest   extends UserType("guest")

  lazy val values = Seq(Admin, Regular, Guest)

}