functionp

functionp Function

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 

Notes:

(functionp object) ≡ (typep object ’function)

Expanded Reference: functionp

tip

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(functionp )