Nullable types

[bearophile]

Stewart Gordon:
> It seems that Delight had the same idea as Nice.  Which was first?

Nice was first, of course.


> Is there any language where you can have multiple levels of nullness?

Cyclone has a quite refined (and it looks over-engineered) view of nullable pointers and the like.
Boxes similar to nullable types are used often in Haskell, see the Maybe monad, etc.

Bye,
bearophile