Data.Char

ASCII character classification.

Operates on the byte/codepoint returned by byte_at/char_at. The prelude opens this module.

Functions and Values

is_digit : (Int) -> Bool

True for an ASCII decimal digit (0-9).

is_upper : (Int) -> Bool

True for an ASCII upper-case letter (A-Z).

is_lower : (Int) -> Bool

True for an ASCII lower-case letter (a-z).

is_alpha : (Int) -> Bool

True for an ASCII letter.

is_alnum : (Int) -> Bool

True for an ASCII letter or digit.

is_space : (Int) -> Bool

True for ASCII whitespace (space, tab, newline, or carriage return).

to_lower_c : (Int) -> Int

Lower-case an ASCII letter; any other codepoint is returned unchanged.

to_upper_c : (Int) -> Int

Upper-case an ASCII letter; any other codepoint is returned unchanged.