Arguments and Values

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, char-downcase, Characters With Case, Documentation of Implementation-Defined Scripts

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