characterp object → generalized-boolean

object — an object.

generalized-boolean — a generalized boolean.

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

(characterp #\a) → true 
(characterp 'a) → false 
(characterp "a") → false 
(characterp 65.) → false 
(characterp #\Newline) → true 
;; This next example presupposes an implementation 
;; in which #\Rubout is an implementation-defined character. 
(characterp #\Rubout) → true

character (type and function), typep

(characterp object) ≡ (typep object 'character)