class5 members

CheckDigits

public static class CheckDigits

Check digit helpers used by the expression engine (Mod10, Luhn, Mod11, Mod43, VoicePickCode).

Method Signature	Returns	Description
static # `Luhn(string digits)`	`string`	Luhn (ISO/IEC 7812) check digit. Non-digits are ignored.
static # `Mod10(string digits)`	`string`	GS1 / UPC modulo 10 check digit (weights 3,1,3,… from the right). Non-digits are ignored.
static # `Mod11(string digits)`	`string`	Modulo 11 check digit with weights 2..7 cycling from the right; remainder 0 → "0", 1 → "X".
static # `Mod43(string data)`	`string`	Code 39 modulo 43 check character.
static # `VoicePickCode(string gtin, string lot, string? date = default)`	`string`	Produce Traceability Initiative voice pick code: CRC-16 (polynomial 0x1021, initial value 0) over the ASCII text GTIN + lot (+ optional pack date YYMMDD); the four least significant decimal digits of the CRC.