chickadee » scheme » not

Not returns #t if obj is false, and returns #f otherwise.

(not #t)           ===>  #f
(not 3)            ===>  #f
(not (list 3))     ===>  #f
(not #f)           ===>  #t
(not '())          ===>  #f
(not (list))       ===>  #f
(not 'nil)         ===>  #f