Function RPLACA, RPLACD

Syntax

rplaca cons object → cons
rplacd cons object → cons

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.

Affected By

None.

Exceptional situations

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

Example Implementation

To be done.

Notes