Jon Pretty

enum List[+T] { case Nil; case ::(head: T, tail: List[T]) } vs sealed trait List[+T] case object Nil extends List[T] case class ::[T](hea...

Now implement one of List's methods. I'll wait.

implicit class ListMethods[+T](list: List[T]) { ... } But I think that's the point: an "enum" is closer to a pure ADT.

I think now we are deep into post-hoc rationalization. Yes, this enum impl is very poorly designed, but no, it doesn't have to be this way.

I'm not sure it is that way, if you read @odersky's original motivation. I totally believe that he added the feature reluctantly...

I'm also not convinced by them. But I'm unwilling to binarily call them a disaster before I've tried using them extensively.

Nothing of that will matter once we start ending argument lists with `,`!

Thankfully, for me it did that! No point in wasting more contributions on language with such rapidly declining quality standards. :-) #Scala