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Null object: Difference between revisions
→{{header|Racket}}
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foo <- function(){} # function that does nothing
foo() # returns NULL</lang>
=={{header|Racket}}==
"null", or its literal form "'()", is used to denote empty lists and
sometimes it is used as a generic null value.
<lang Racket>
-> null
'()
-> (null? null)
#t
-> (null? 3)
#f
</lang>
But a value that is more used as a generic "nothing" value is "#f",
false. Racket also has a void value, mostly the result of side-effect
functions. (And an undefined value.)
=={{header|Raven}}==
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