listp

listp Function

Syntax:

listp object → generalized-boolean

Arguments and Values:

object—an object.

generalized-boolean—a generalized boolean.

Description:

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

Examples:

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

See Also:

consp

Notes:

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))

Expanded Reference: listp

tip

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(listp )