listp [Function]

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::

section consp [Function]

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))

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