CUIT - CUIL

cuit-cuil.js

function generateCUIL(dni, type) {
  if (dni.toString().length < 7) return false;

  let xy = 30;
  
  if (type === 'f') {
    xy = 27;
  } else if(type === 'm') {
    xy = 20;
  }
  
  const parts = `${dni}`.split('');
  const diff = 8 - parts.length;
  
  for (let i = 0; i < diff; i++) {
    parts.unshift('0');
  }
  
  parts.unshift(...`${xy}`.split(''))

  const numbers = '5432765432'.split('');
  let sum  = 0;

  for (let i = 0; i <= 9; i++) {
    sum += +parts[i] * +numbers[i];
  }

  const remainder = sum % 11;
  let z = 11 - remainder;

  if (remainder === 0) {
    z = 0;
  } else if (remainder === 1 && type === 'm') {
    z = 9;
    xy = 23;
  } else if (remainder === 1 && type === 'f') {
    z = 4;
    xy = 23;
  }
  return `${xy}-${dni}-${z}`;
}

function validateCUIT(number, type) {
  const parts = `${number}`.split('');

  if (parts.length !== 11) return false;

  const numbers = '5432765432'.split('');
  let sum = 0;

  for (let i = 0; i <= 9; i++) {
    sum += +parts[i] * +numbers[i];
  }

  const remainder = sum % 11;
  let z = 11 - remainder;

  if (remainder === 0) {
    z = 0;
  } else if (remainder === 1 && type === 'm') {
    z = 9;
    xy = 23;
  } else if (remainder === 1 && type === 'f') {
    z = 4;
    xy = 23;
  } else if (remainder === 1) {
    z = 9;
  }

  return z === +parts[10];
}

cuit_validation.rb

class Object
  def valid_cuit?
    number = self.to_s.gsub(/\D/, '').split('')

    return if number.size != 11

    numbers = %w(5 4 3 2 7 6 5 4 3 2)
    result  = 0

    10.times.each { |i| result += number[i].to_i * numbers[i].to_i }

    result = result % 11
    result = 11 - result

    result = 0 if result == 11
    result = 9 if result == 10

    result == number[10].to_i
  end
end

20311251407.valid_cuit? # => true
"20-31125140-7".valid_cuit? # => true
20311251405.valid_cuit? # => false