ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
28 lines (27 loc) • 993 B
JavaScript
;
/**
* ibantools-germany
* Copyright (c) 2022-2026 Markus Baumer <markus@baumer.dev>
* SPDX-License-Identifier: MIT OR MPL-2.0
*/
Object.defineProperty(exports, "__esModule", { value: true });
const helper_1 = require("../helper");
exports.default = (number) => {
const digits = (0, helper_1.getDigits)(number);
const givenCheckDigit = digits.pop(); // Check digit is last digit
const transformMatrix = [
[0, 1, 5, 9, 3, 7, 4, 8, 2, 6],
[0, 1, 7, 6, 9, 8, 3, 2, 5, 4],
[0, 1, 8, 4, 6, 2, 9, 5, 7, 3],
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
];
digits.reverse();
const transformedDigits = digits.map((digit, index) => transformMatrix[index % 4][digit]);
const sum = (0, helper_1.calculateSum)(transformedDigits);
const sumUnit = (0, helper_1.getUnitFromNumber)(sum);
const calculatedCheckDigit = 10 - sumUnit;
if (givenCheckDigit === calculatedCheckDigit) {
return "VALID";
}
return "INVALID";
};