13.2.15 upper-case-p, lower-case-p, both-case-p [Function]

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, Characters With Case, Documentation of Implementation-Defined Scripts