Selects Unicode character with a numeric value.

Note: a character may have a numeric value but return False with the predicate isNumber, because isNumber only tests GeneralCategory: some CJK characters are OtherLetter and do have a numeric value.

isNumeric c == isJust (numericValue c)

Since: 0.3.1

Numeric value of a character, if relevant.

Note: a character may have a numeric value but return False with the predicate isNumber, because isNumber only tests GeneralCategory: some CJK characters are OtherLetter and do have a numeric value.

Since: 0.3.1

Integer value of a character, if relevant.

This is a special case of numericValue.

Warning: There is a risk of integer overflow depending of the chosen concrete return type. As of Unicode 15.1 the results range from 0 to 1e16.

>>> minimum [v | v@Just{} <- integerValue <$> [minBound..]] :: Maybe Integer
Just 0
>>> maximum (integerValue <$> [minBound..]) :: Maybe Integer
Just 10000000000000000
>>> integerValue '\x4EAC' :: Maybe Int64 -- OK
Just 10000000000000000
>>> integerValue '\x4EAC' :: Maybe Int32 -- Will overflow!
Just 1874919424

Therefore it is advised to use: integerValue @Int64.

Note: A character may have a numeric value but return False with the predicate isNumber, because isNumber only tests GeneralCategory: some CJK characters are OtherLetter and do have a numeric value.

Since: 0.3.1

Same a intToDigit, but with upper case.

>>> intToDigiT <$> [0..15]
"0123456789ABCDEF"

Since: 0.6.0