14.2.31 nthcdr [Function]

nthcdr n list ⇒ tail

Arguments and Values::

n—a non-negative integer.

list—a list,

which might be a dotted list or a circular list.

tail—an object.

Description::

Returns the tail of list that would be obtained by calling cdr n times in succession.

Examples::

 (nthcdr 0 '()) ⇒  NIL
 (nthcdr 3 '()) ⇒  NIL
 (nthcdr 0 '(a b c)) ⇒  (A B C)
 (nthcdr 2 '(a b c)) ⇒  (C)
 (nthcdr 4 '(a b c)) ⇒  ()
 (nthcdr 1 '(0 . 1)) ⇒  1

 (locally (declare (optimize (safety 3)))
   (nthcdr 3 '(0 . 1)))
 Error: Attempted to take CDR of 1.

Exceptional Situations::

Should signal an error of type type-error if n is not a non-negative integer.

For n being an integer greater than 1, the error checking done by (nthcdr n list) is the same as for (nthcdr (- n 1) (cdr list)); see the function cdr.

See Also::

cdr, nth , rest