Syntax:

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

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also: None.

Notes:

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

• FUNCTION-TYPE:X3J13-MARCH-88