Documentation

isAscii :: Char -> Bool Source

Selects the first 128 characters of the Unicode character set, corresponding to the ASCII character set.

isLatin1 :: Char -> Bool Source

Selects the first 256 characters of the Unicode character set, corresponding to the ISO 8859-1 (Latin-1) character set.

isControl :: Char -> Bool Source

Selects control characters, which are the non-printing characters of the Latin-1 subset of Unicode.

isPrint :: Char -> Bool Source

Selects printable Unicode characters (letters, numbers, marks, punctuation, symbols and spaces).

isSpace :: Char -> Bool Source

Returns True for any Unicode space character, and the control characters \t, \n, \r, \f, \v.

isUpper :: Char -> Bool Source

Selects upper-case or title-case alphabetic Unicode characters (letters). Title case is used by a small number of letter ligatures like the single-character form of Lj.

isLower :: Char -> Bool Source

Selects lower-case alphabetic Unicode characters (letters).

isAlpha :: Char -> Bool Source

Selects alphabetic Unicode characters (lower-case, upper-case and title-case letters, plus letters of caseless scripts and modifiers letters). This function is equivalent to Data.Char.isLetter.

isDigit :: Char -> Bool Source

Selects ASCII digits, i.e. '0'..'9'.

isOctDigit :: Char -> Bool Source

Selects ASCII octal digits, i.e. '0'..'7'.

isHexDigit :: Char -> Bool Source

Selects ASCII hexadecimal digits, i.e. '0'..'9', 'a'..'f', 'A'..'F'.

isAlphaNum :: Char -> Bool Source

Selects alphabetic or numeric digit Unicode characters.

Note that numeric digits outside the ASCII range are selected by this function but not by isDigit. Such digits may be part of identifiers but are not used by the printer and reader to represent numbers.

digitToInt :: Char -> Int Source

Convert a single digit Char to the corresponding Int. This function fails unless its argument satisfies isHexDigit, but recognises both upper and lower-case hexadecimal digits (i.e. '0'..'9', 'a'..'f', 'A'..'F').

intToDigit :: Int -> Char Source

Convert an Int in the range 0..15 to the corresponding single digit Char. This function fails on other inputs, and generates lower-case hexadecimal digits.

toUpper :: Char -> Char Source

Convert a letter to the corresponding upper-case letter, if any. Any other character is returned unchanged.

toLower :: Char -> Char Source

Convert a letter to the corresponding lower-case letter, if any. Any other character is returned unchanged.

ord :: Char -> Int Source

The Prelude.fromEnum method restricted to the type Data.Char.Char.

chr :: Int -> Char Source

The Prelude.toEnum method restricted to the type Data.Char.Char.

readLitChar :: ReadS Char Source

Read a string representation of a character, using Haskell source-language escape conventions, and convert it to the character that it encodes. For example:

 readLitChar "\\nHello"  =  [('\n', "Hello")]

showLitChar :: Char -> ShowS Source

Convert a character to a string using only printable characters, using Haskell source-language escape conventions. For example:

 showLitChar '\n' s  =  "\\n" ++ s

lexLitChar :: ReadS String Source

Read a string representation of a character, using Haskell source-language escape conventions. For example:

 lexLitChar  "\\nHello"  =  [("\\n", "Hello")]

data Char

Instances

Bounded Char
Enum Char
Eq Char
Ord Char
Read Char
Show Char
Ix Char
Typeable Char
Generic Char
Storable Char
Random Char

type String = [Char]Source

A String is a list of characters. String constants in Haskell are values of type String.