consp [Function]

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::

section listp [Function]

Notes::

 (consp object) == (typep object 'cons) == (not (typep object 'atom)) == (typep object '(not atom))

Go to the first, previous, next, last section, table of contents.