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ANSI Common Lisp  14 Conses 14.2 Dictionary of Conses
- 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))
- Allegro CL Implementation Details:
-
None.
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