text: /**
   * Given an array of domains, return the object with the appearances of the DNS.
   *
   * @param {Array} domains
   * @return {Object}
   *
   * @example
   * domains = [
   *  'code.yandex.ru',
   *  'music.yandex.ru',
   *  'yandex.ru'
   * ]
   *
   * The result should be the following:
   * {
   *   '.ru': 3,
   *   '.ru.yandex': 3,
   *   '.ru.yandex.code': 1,
   *   '.ru.yandex.music': 1,
   * }
   *
   */
  function getDNSStats(domains) {
    const res = {};
    domains.forEach((str) => {
      const arrStr = str.split('.').reverse();
      let dom = '';
      arrStr.forEach((item) => {
        dom += `.${item}`;
        if (res[dom] !== undefined) res[dom] += 1;
        else res[dom] = 1;
      });
    });
    return res;
  }
  
  module.exports = getDNSStats;
  