Comments on: A Post About Nothing

By: Matt

Matt — Thu, 20 Dec 2018 12:55:02 +0000

Thanks for the clear comparisons. I understand them all as separate now, with the exception of None and Unit. If a method that doesn’t return a value of any sort returns Unit (a unary type, with a single instantiation), couldn’t Option[T] be rather defined as either T or Unit. Is there a reason for the None object? It seems to me None.type has a single instantiation None and Unit has a single instantiation (). These seem parallel to me. Perhaps I’ve missed something.

I’ve tried searching for distinctions without success. Just interested if someone knows

By: ahmad

ahmad — Fri, 26 Oct 2018 09:54:26 +0000

“If any of these is a little difficult to get, it’s Nothing. Nothing is another trait.”

But it’s not a trait it is an abstract final class!

By: Prashant

Prashant — Tue, 05 Jun 2018 14:39:50 +0000

Hi Matt, Very good explanation! Could you please elaborate on Nothing.

val emptyIntList: List[Int] = List[Nothing]()

Above thing can be achieved using below approach:

val emptyIntList: List[Int] = List()

Thanks in advance