functionp (Function)

Syntax:

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)