Verifies that an item evaluates to nil
(not item)
Typically, the null function is used for lists, and not is used for other data types along with some types of control functions.
T if item evaluates to nil; otherwise nil.
Command: (setq a 123 b "string" c nil)
nil
Command: (not a)
nil
Command: (not b)
nil
Command: (not c)
T
Command: (not '())
T
See Also
-
The null function.