RIO.Char.Partial

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 (that is, '0'..'9', 'a'..'f', 'A'..'F').

Examples

Characters '0' through '9' are converted properly to 0..9:

>>> map digitToInt ['0'..'9'][0,1,2,3,4,5,6,7,8,9]

Both upper- and lower-case 'A' through 'F' are converted as well, to 10..15.

>>> map digitToInt ['a'..'f'][10,11,12,13,14,15]>>> map digitToInt ['A'..'F'][10,11,12,13,14,15]

Anything else throws an exception:

>>> digitToInt 'G'*** Exception: Char.digitToInt: not a digit 'G'>>> digitToInt '♥'*** Exception: Char.digitToInt: not a digit '\9829'

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.

The Prelude.toEnum method restricted to the type Char.