listp object → generalized-boolean

object — an object.

generalized-boolean — a generalized boolean.

Returns true if object is of type list; otherwise, returns false.

(listp nil) → true 
(listp (cons 1 2)) → true 
(listp (make-array 6)) → false 
(listp t) → false

consp

If object is a cons, listp does not check whether object is a proper list; it returns true for any kind of list.

(listp object) ≡ (typep object 'list) ≡ (typep object '(or cons null))