|Parameters||l, a list|
|Purpose||Determines if l is empty.|
|Produces||A truth value: true (|
|Preconditions||Only one parameter (verified).|
|Postconditions||Also returns false if the parameter is not a list.|
> (null? ()) #t > (null? null) #t > (null? (cdr (list 'a))) #t > (null? (list 'a 'b 'c)) #f > (null? 'a) #f > (null? 2) #f
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