setf.Example:
(defparameter *crazy* '(1 #(a (2 #(b (3 #(c (4 t))))))))
==> *CRAZY*
Change the last t to nil with modf:
(modf
(cadr (aref (cadr (aref (cadr (aref (cadr *crazy*) 1)) 1)) 1))
nil)
==> (1 #(A (2 #(B (3 #(C (4 NIL)))))))
Original data is unchanged:
*crazy*
==> (1 #(A (2 #(B (3 #(C (4 T)))))))
Homepage: GitHub
License: BSD
See Also: versioned-objects
Topics: language extension