upper-case-p, lower-case-p, both-case-p

upper-case-p, lower-case-p, both-case-p Function

Syntax:

upper-case-p character → generalized-boolean

lower-case-p character → generalized-boolean

both-case-p character → generalized-boolean

Arguments and Values:

character—a character .

generalized-boolean—a generalized boolean.

Description:

These functions test the case of a given character.

upper-case-p returns true if character is an uppercase character ; otherwise, returns false. lower-case-p returns true if character is a lowercase character ; otherwise, returns false. both-case-p returns true if character is a character with case; otherwise, returns false.

Examples:

(upper-case-p #\A) → true 
(upper-case-p #\a) → false 
(both-case-p #\a) → true 
(both-case-p #\5) → false 
(lower-case-p #\5) → false 
(upper-case-p #\5) → false 
;; This next example presupposes an implementation 
;; in which #\Bell is an implementation-defined character. 
(lower-case-p #\Bell) → false 

Exceptional Situations:

Should signal an error of type type-error if character is not a character .

See Also:

char-upcase, char-downcase, Section 13.1.4.3 (Characters With Case), Section 13.1.10 (Documentation of Implementation-Defined Scripts)

Expanded Reference: upper-case-p, lower-case-p, both-case-p

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(upper-case-p, lower-case-p, both-case-p )