sadikay

// Examples:
// Valid: "3973535717", "2037637860", "2823097943", "2012460224"
// Not Valid: "3973535711", "123", "9999999999", 

function verifyVkn(vkn) {
  if (typeof vkn !== 'string') throw new TypeError('vkn should be a string');
  if (vkn.length !== 10) throw new TypeError('invalid length');

  const digits = vkn.split('');
  const control = digits.pop(); // eslint-disable-line