(scheme char)
Character classes, case mappings and case-insensitive comparisons, by Unicode. The properties and mappings are the JDK's, so every backend answers alike.
| Name | Example | Result |
|---|---|---|
char-alphabetic? | (char-alphabetic? #\a) | #t |
char-numeric? | (char-numeric? #\7) | #t |
char-whitespace? | (char-whitespace? #\space) | #t |
char-upper-case? | (char-upper-case? #\A) | #t |
char-lower-case? | (char-lower-case? #\a) | #t |
digit-value | (digit-value #\3) | 3 |
char-upcase | (char-upcase #\a) | #\A |
char-downcase | (char-downcase #\A) | #\a |
char-foldcase | (char-foldcase #\A) | #\a |
char-ci=? | (char-ci=? #\a #\A) | #t |
char-ci<? | (char-ci<? #\a #\B #\c) | #t |
char-ci>? | (char-ci>? #\c #\B #\a) | #t |
char-ci<=? | (char-ci<=? #\a #\A #\b) | #t |
char-ci>=? | (char-ci>=? #\b #\B #\a) | #t |
string-ci=? | (string-ci=? "Hello" "hELLO") | #t |
string-ci<? | (string-ci<? "apple" "BANANA") | #t |
string-ci>? | (string-ci>? "b" "A") | #t |
string-ci<=? | (string-ci<=? "a" "A" "b") | #t |
string-ci>=? | (string-ci>=? "b" "B" "a") | #t |
string-upcase | (string-upcase "Hello") | "HELLO" |
string-downcase | (string-downcase "HELLO") | "hello" |
string-foldcase | (string-foldcase "Straße") | "strasse" |