This is basexx, a package for converting numbers to digit strings in various bases and vice versa.
To get the Base30 encoding of the number 412:
var sb strings.Builder if err := basexx.EncodeInt64(&sb, 412, basexx.Base30); err != nil { ... } result := sb.String()To decode the Base30 digit string "fr":
result, err := basexx.DecodeString("fr", basexx.Base30)To convert a digit string x in base from to a new digit string in base to:
result, err := basexx.Convert(x, from, to)To define your own new number base:
// ReverseBase10 uses digits '9' through '0' just to mess with you. type ReverseBase10 struct{} func (ReverseBase10) N() int64 { return 10 } func (ReverseBase10) Digit(val int64) (byte, error) { if val < 0 || val > 9 { return 0, errors.New("digit value out of range") } return byte('9' - val), nil } func (ReverseBase10) Val(digit byte) (int64, error) { if digit < '0’ || digit > '9' { return 0, errors.New("invalid encoded digit") } return int64(9 - (digit - '0’)) }