363 B
363 B
Boolean Logic
not
(not value)
not
returns nil if value
is non-nil, otherwise, it returns t
.
or
(or &rest values)
or
returns its first non-nil argument, or nil if all arguments are
nil.
and
(and &rest values)
and
returns its last argument if all arguments are non-nil, or nil if
it encounters a nil argument.