Werkgeversnummer valideren met typescript

validate.ts

/**
 * Damm algorithm is a check digit algorithm that detects all single-digit errors and all adjacent transposition errors
 * https://en.wikipedia.org/wiki/Damm_algorithm
 *
  * Live typescript playground at: https://www.typescriptlang.org/play?ssl=33&ssc=1&pln=1&pc=1#code/PQKhCgAIUgRBDAtoy8A2BzA9gJwJYAuAFingM6qQDGRAplQNaQAmeGhqmuhJkx8BFrQL0CFdGkhk8AOwxpaAWlbtBtHDlziZzTpPjMAVvCq0ZggjngyyAByzSCeLDMjrNOMlBhECBW2QAXMDAZgB0AO54DHi2tKzwYbgYwFExwAjIAPro2PjEiN7A4FQuZIJYcVZOLgAq8ABGCpAAvJAA2lCQ3e0ADAA0kADMgwCMgwDsgwCsgwCcgwAcgwBsgwAsgwBMALr9XT1TkAOQC5BbYzMbS6uDQ3sHHZvngydrkMuQR+PDV6cP3R6PyOs2O8xuv0gzwukBWAMB7XePxhIzBUL+ZyOi3hPVR7yO0Ne4MgoM+oxxHVJt1Ok22RMgP1R6wp7U+Z2eoLxdLRwJZ7LuEKRtJeaOmLJhVIZ10h+OJvQeOwA3OBwKAINBIAA1dB4ZgCWiUdgANzMkBkAFdEA11JBzdI5JBCAByCiwACCAFkPdQ6IwWGxCGFvJAAAI4YTmnA2Pg4c0GvAAMzNlutOEdFCNOuYgwT6DIBqwxHUUXzQegxQT5pkVBqrhN+ATAE9MogAMK+hiwAMEAAUsls5oIgSkllkGAAlJAAN6PcMESOuHuPQGQYAAPQAOswp0MAL4bsJbnf7w-b0a7gAkwDCInKfZkA4Ik4AZM-l4D+4P3yvumFw7Y0BMWge2AA9gAwQYnSdcdvx-MI7DQQgeygmCfzQyA-3ic1TB7HtNAiQYVEIScWgAPkgSp1AEZwZHqJpaHafCdnaABqIiCD2Y4SJaNpekecdlV3FVShsLAFDCNAsAwHt60TZskDbDsu1UZDRi2IYwnWaYVjCFZoIE8AgA
 */
const operationTable = [
    [0, 3, 1, 7, 5, 9, 8, 6, 4, 2],
    [7, 0, 9, 2, 1, 5, 4, 8, 6, 3],
    [4, 2, 0, 6, 8, 7, 1, 3, 5, 9],
    [1, 7, 5, 0, 9, 8, 3, 4, 2, 6],
    [6, 1, 2, 3, 0, 4, 5, 9, 7, 8],
    [3, 6, 7, 4, 2, 0, 9, 5, 8, 1],
    [5, 8, 6, 9, 7, 2, 0, 1, 3, 4],
    [8, 9, 4, 5, 3, 6, 2, 0, 1, 7],
    [9, 4, 3, 8, 6, 1, 7, 2, 0, 5],
    [2, 5, 8, 1, 4, 3, 6, 7, 9, 0],
];

/**
 * Validate a given number using it's DAMM check digit.
 * @returns true if number is valid, false otherwise.
 */
function verifyDammCheckDigit(input: string) {
    return (
        /^[1-9]\d{2}\.\d{3}\.\d{1}$/.test(input) && // adjust regex for different type of numbers
        input
            .replace(/\./g, '') // strip all . characters from input
            .split('') // split input string in individual characters/digits
            .reduce((row, digit) => operationTable[row][+digit], 0) === 0 // use each digit as column index and use outcome as next row index
    );
}

console.log(verifyDammCheckDigit('123.456.6'));

Het regex patroon op regel 26 moet zijn /^[1-9]\d{2}\.\d{3}\.\d$/ (nummer mag niet met 0 beginnen)

Het regex patroon op regel 26 moet zijn /^[1-9]\d{2}\.\d{3}\.\d$/ (nummer mag niet met 0 beginnen)

Thanks. Opgelost.

Deze controle is trouwens voor het formaat 999.999.9, maar de regex kan aangepast worden voor kortere/langere nummers, zoals bijvoorbeeld /^[1-9]\d{2}\.\d{3}\.\d{3}$/ voor 999.999.999. De controle gaat er wel vanuit dat het laatste cijfer het controlegetal is.