char-alphabetic? -- r7rs Definition

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Kind

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predicate;

Implemented by

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• char-alphabetic? (from vonuvoli);

Procedure signature

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Procedure variants:

• ((character-ascii-alphabetic) -> (true))
  • input: a value of type character-ascii-alphabetic;
  • output: a value of type true;
• ((character-alphabetic) -> (true))
  • input: a value of type character-alphabetic;
  • output: a value of type true;
• ((character) -> (false))
  • input: a value of type character;
  • output: a value of type false;

Exports

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• scheme:char -- (scheme char);

Exports recursive

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• scheme -- (scheme);

Description

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(char-alphabetic? char)
(char-numeric? char)
(char-whitespace? char)
(char-upper-case? letter)
(char-lower-case? letter)

These procedures return #t if their arguments are alphabetic, numeric, whitespace, upper case, or lower case characters, respectively, otherwise they return #f.

Specifically, they must return #t when applied to characters with the Unicode properties Alphabetic, Numeric_Digit, White_Space, Uppercase, and Lowercase respectively, and #f when applied to any other Unicode characters. Note that many Unicode characters are alphabetic but neither upper nor lower case.

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The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• character-ascii-alphabetic;
• true;
• character-alphabetic;
• character;
• false;