Convert String value to Int, or Int to String, with given radix.
The parseInt function here is similar to Javascript's parseInt(), parsing a
decimal string and returning the corresponding Int value if any. parseIntOct,
parseIntHex, and parseIntRadix parse strings encoded as octal, hexadecimal,
or arbitrary radix, respectively.
The toRadix function inverts parseInt. toRadix 10 is equivalent to
toString for Int arguments.
Convert String to Int assuming base 8 (octal). No leading '0' is required.
Convert String to Int assuming base 16 (hexadecimal). No leading characters
are expected; input starting with "0x" (or any other out of range character)
will cause an Err return.
Convert String to Int assuming given radix. Radix can be any of
2..36. Leading zeroes are ignored. Valid characters are the alphanumerics: those
in the ASCII range [0-9a-zA-Z]. Case does not matter. For radixes beyond 16 the
normal [A-F] range for hexadecimal is extended in the natural way. Any invalid
character results in a Err return. Any valid character outside of the range
defined by the radix also results in an Err. In particular, any initial '-' or
' ' (space) is an error. An Ok return means that the entire input string was
consumed. The empty string results in Ok 0
parseIntRadix 16 "DEADBEEF" = Ok 3735928559Convert Int to String assuming given radix. Radix values from 2..36 are
allowed; others result in an Err InvalidRadix. Negative numbers get an initial
'-'.
toRadix 16 1234 == Ok "4D2"
toRadix 8 -99 == Ok "-143"Convert Int to String assuming given radix. Radix value must be in 2..36 (not checked, so it can crash).
toRadix' 16 3735928559 == "DEADBEEF"
toRadix' 37 36 --> crashPossible Result.Err returns from these functions.
Convert String to Int assuming base 10.