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Index
atom Conses Dictionary car
Function

rplaca, rplacd

rplaca cons object ⇒ cons

rplacd cons object ⇒ cons

Pronunciation

rplaca: pronounced ,r\=e ’plak e or pronounced ,re ’plak e

rplacd: pronounced ,r\=e ’plak de or pronounced ,re ’plak de or pronounced ,r\=e ’plak d\=e or pronounced ,re ’plak d\=e

Arguments and Values

consa cons.
objectan object.

Description

rplaca replaces the car of the cons with object.

rplacd replaces the cdr of the cons with object.

Examples

 (defparameter *some-list* (list* 'one 'two 'three 'four)) ⇒  *some-list*
 *some-list* ⇒  (ONE TWO THREE . FOUR)
 (rplaca *some-list* 'uno) ⇒  (UNO TWO THREE . FOUR)
 *some-list* ⇒  (UNO TWO THREE . FOUR)
 (rplacd (last *some-list*) (list 'IV)) ⇒  (THREE IV)
 *some-list* ⇒  (UNO TWO THREE IV)

Side Effects

The cons is modified.

Should signal an error of type type-error if cons is not a cons.

Backlinks

car, cdr, caar, cadr, cdar, cddr, caaar, caadr, cadar, caddr, cdaar, cdadr, cddar, cdddr, caaaar, caaadr, caadar, caaddr, cadaar, cadadr, caddar, cadddr, cdaaar, cdaadr, cdadar, cdaddr, cddaar, cddadr, cdddar, cddddr, Cons Concepts, Conses Dictionary, defsetf, member, member-if, member-if-not, rassoc, rassoc-if, rassoc-if-not, Symbols in the COMMON-LISP Package