BSN Netherlands validation

validateBsn.js

export default const validateBsn = (bsn = '') => {
  // Needs to be 9 characters
  if (bsn.length !== 9) {
    return false;
  }

  const VALUES = [9, 8, 7, 6, 5, 4, 3, 2, -1];
  const total = bsn
    .split('') // make it an enumerable
    .reduce((p, c, i) => Number(p) + c * VALUES[i], 0);

  return total % 11 === 0;
};