8.12
4.2 Characters
Returns #true, if v is a character; #false, otherwise.
procedure
v : any/c
Returns #true, if v is a Unicode Scalar Value; #false, otherwise.
procedure
c : char?
Returns a Unicode Scalar Value that represents c.
procedure
n : unicode-scalar-value?
Returns the character represented by n.
4.2.1 Comparison
Returns #true, if the cs are equivalent; #false, otherwise.
Returns #true, if the cs are ordered by increasing Scalar Values; #false, otherwise.
Returns #true, if the cs are ordered by decreasing Scalar Values; #false, otherwise.
Returns #true, if the cs are ordered by nondecreasing Scalar Values; #false, otherwise.
Returns #true, if the cs are ordered by nonincreasing Scalar Values; #false, otherwise.
4.2.1.1 Case-Insensitive Comparison
Like char=?, but case-insensitive.
Like char<?, but case-insensitive.
Like char>?, but case-insensitive.
Like char≤?, but case-insensitive.
Like char≥?, but case-insensitive.
4.2.2 Contracts
procedure
(char-in c1 c2) → flat-contract?
c1 : char? c2 : char?
Returns a flat contract that recognizes a character with a code point between that of c1 and c2, inclusive.
4.2.3 Conversions
procedure
(char-uppercase c) → char?
c : char?
Returns the uppercase character associated with c, as defined by Unicode. In the case that no such mapping is defined, returns c.
procedure
(char-lowercase c) → char?
c : char?
Like char-uppercase, but for lowercase mapping.
procedure
(char-titlecase c) → char?
c : char?
Like char-uppercase, but for titlecase mapping.
procedure
(char-foldcase c) → char?
c : char?
Like char-uppercase, but for case-folding mapping.