functionp [Function]

functionp object => generalized-boolean

Arguments and Values::

object---an object.

generalized-boolean---a generalized boolean.

Description::

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

Examples::

 (functionp 'append) =>  false
 (functionp #'append) =>  true
 (functionp (symbol-function 'append)) =>  true
 (flet ((f () 1)) (functionp #'f)) =>  true
 (functionp (compile nil '(lambda () 259))) =>  true
 (functionp nil) =>  false
 (functionp 12) =>  false
 (functionp '(lambda (x) (* x x))) =>  false
 (functionp #'(lambda (x) (* x x))) =>  true

Notes::

 (functionp object) == (typep object 'function)

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