nthcdr

nthcdr Function

Syntax:

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

Expanded Reference: nthcdr

tip

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