parseHex static method
Parses source as a hexadecimal numeral.
Returns an Int64 with the numerical value of source.
If the numerical value of source does not fit
in a signed 64 bit integer,
the numerical value is truncated to the lowest 64 bits
of the value's binary representation,
interpreted as a 64-bit two's complement integer.
The source string must contain a sequence of hexadecimal
digits (0-9, a-f or A-F), possibly prefixed by a - sign.
Throws a FormatException if the input is not a valid hexadecimal integer numeral.
Implementation
static Int64 parseHex(String source) => _parseRadix(source, 16, true)!;