&keykey test test-not → generalized-boolean
Whether a list element is the same as another list element is determined by the functions specified by the keyword arguments. The first argument to the
:test-not function is typically part of an element of list-1 extracted by the
:key function; the second argument is typically part of an element of list-2 extracted by the
The argument to the
:key function is an element of either list-1 or list-2; the return value is part of the element of the supplied list element. If
:key is not supplied or nil, the list-1 or list-2 element itself is supplied to the
(defparameter *cosmos* '(1 "a" (1 2)))
(subsetp '(1) *cosmos*)
(subsetp '(1 "A") *cosmos* :test #'equalp)
(subsetp '((1) (2)) '((1) (2)))
(subsetp '((1) (2)) '((1) (2)) :key #'car)
Should be prepared to signal an error of type type-error if list-1 and list-2 are not proper lists.
To be done.
:test-not parameter is deprecated.