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Null object: Difference between revisions
Added F# version
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Atoms are erlang's user-defined constants that always evaluates to is itself. It is also equal to no other value else but itself.
=={{header|F_Sharp|F#}}==
As a .Net languages F# inherits the null as a potential value for object variables.
Other than in interfacing assemblies written in other .Net languages, null rarely serves a purpose in F# code.
Contrived code, to show using null, as per task description:
<lang fsharp>let sl : string list = [null; "abc"]
let f s =
match s with
| null -> "It is null!"
| _ -> "It's non-null: " + s
for s in sl do printfn "%s" (f s)</lang>
=={{header|Factor}}==
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