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 obj = {};
  
    domains.map((e) => {
      let arr = e.split('.');
      arr = arr.reverse().map((el) => `.${el}`);
      for (let i = 0; i < arr.length; i++) {
        if (i) arr[i] = `${arr[i - 1]}${arr[i]}`;
        if (arr[i] in obj) {
          obj[arr[i]]++;
        } else {
          obj[arr[i]] = 1;
        } // end if else
      } // end for
      return e;
    });
    return obj;
  }
  
  module.exports = getDNSStats;
  