Sum algebraic data types are the ones in which we can simply enumerate all the possible values of a type and provide a separate constructor for each value. As an example, let's consider the months of the year. There are only 12 and they cannot change (hopefully):
sealed abstract trait Monthcase object January extends Monthcase object February extends Monthcase object March extends Monthcase object April extends Monthcase object May extends Monthcase object June extends Monthcase object July extends Monthcase object August extends Monthcase object September extends Monthcase object October extends Monthcase object November extends Monthcase object December extends Monthobject MonthDemo { def main(args: Array[String]): Unit = { val ...
