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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::

listp

Notes::

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