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Code Smells Catalog
(luzkan.github.io)
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The items don't seem concise and always clear. But seems like a good, inspiring resource for things to consider.
I've never heard of evading null with a Null object. Seems like a bad idea to me. Maybe it could work in some language, but generally I would say prefer result typing. Introducing a result type wrapping or extending the result value type is complexity I would be very evasive to introduce if the language doesn't already support result wrapper/state types.
This is quite standard, and in fact it's even a safety feature. C++ introduced nullptr defined as an instance of std::nullptr_t explicitly with this in mind.
https://en.cppreference.com/w/cpp/language/nullptr
This approach is also quite basic in monadic types.
With what in mind? Evading
NULL
?Languages that make use of references rather than pointers don't have this Dualism. C# has nullable references and nullability analysis, and
null
as a keyword.What does your reasoning mean in that context?
Depends on your perspective. It's convenient to lean on type checking to avoid a whole class of bugs. You can see this either as avoiding NULL or use your type system to flag misuses.
C#'s
null
keyword matches the monadic approach I mentioned earlier. Nullable types work as aMaybe
monad. It's the same concept shoehorned differently due to the different paths taken by these languages.as far as I know, C# don't have proper ergonomic monadic bind as in F# (computation expression), Haskell (do expression), and Ocaml (let*), but I could be wrong.
Correct.