consp

consp Function

Syntax:

consp object → generalized-boolean

Arguments and Values:

object—an object.

generalized-boolean—a generalized boolean.

Description:

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

Examples:

(consp nil) → false 
(consp (cons 1 2)) → true 
The *empty list* is not a *cons*, so 
(consp ’()) *≡* (consp ’nil) → false 

See Also:

listp

Notes:

(consp object) ≡ (typep object ’cons) ≡ (not (typep object ’atom)) ≡ (typep object ’(not atom))

Expanded Reference: consp

tip

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(consp )