RosettaCodeData/Task/Null-object/Racket/null-object.rkt

-> null
'()
-> (null? null)
#t
-> (null? 3)
#f
update 2013-06-05 21:47:54 +00:00			`-> null`
			`'()`
			`-> (null? null)`
			`#t`
			`-> (null? 3)`
			`#f`