validatecpf-cakeno/index.js

cpf validator

function digit(array, multiplier) {
  const algorithm = array.reduce((result, num) => result + (num * multiplier--), 0) % 11;
  return algorithm < 2 ? 0 : 11 - algorithm;
}

function cpfValidator(string) {
  let arrNumber = string
    .toString()
    .replace(/\D/g, '')
    .split('')
    .map(Number);
  const multOne = 10;
  const multTwo = 11;

  if (arrNumber.length === 11) {
    let arr = arrNumber.splice(0, 9);
    let digitOne = digit(arr, multOne);
    arr.push(digitOne);
    let digitTwo = digit(arr, multTwo);
    return digitOne === arrNumber[0] && digitTwo === arrNumber[1] ? true : false;
  } else {
    return false;
  }
}

module.exports = cpfValidator;