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rarous/registrationNumberValidator.js

Last active December 6, 2021 10:45
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registrationNumberValidator.js
export function registrationNumberValidator(regNr) {
if (!regNr || (typeof regNr !== "string") || regNr.length !== 8) return false;
const [n8, n7, n6, n5, n4, n3, n2, x] = regNr.split("").map(Number);
return (
x ===
(11 -
((8 * n8 + 7 * n7 + 6 * n6 + 5 * n5 + 4 * n4 + 3 * n3 + 2 * n2) % 11)) %
10
);
}
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