rplaca, rplacd (original) (raw)

ANSI Common Lisp 14 Conses 14.2 Dictionary of Conses

Syntax:

Pronunciation:

rplaca: [ 'rê'plakE ] or [ 'rE'plakE ]

rplacd: [ 'rê'plakdE ] or [ 'rE'plakdE ] or [ 'rê'plakdê ] or [ 'rE'plakdê ]

Arguments and Values:

cons - a cons.

object - an 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.

Allegro CL Implementation Details:

None.