Take the tour ×  How to use nth function in lisp if my my
variable is combination of list and cons-cell for eg: (setq aa
'(1 2) ) (nconc aa (+ 1 2)) this return me (1 2 . 3) when i say
(nth 1 aa) it returns 2 but when i use (nth 2 aa ) it throws
error  share|improve this question add comment  2 Answers  NTH
returns the car of the nth (0, 1, 2 ...) cons cell.  Since your
second cdr is not a cons cell it is an error to get the car of
it.  (nthcdr 2 '(1 2 . 3))   returns 3 (last '(1 2 . 3))
returns (2 . 3)  Usually it is a good idea to avoid improper
lists, where the cdr of some cell is not a cons or NIL.
share|improve this answer add comment  Yeah. Another way to say
it is: "don't do that, then".  share|improve this answer add
comment  Your Answer