var _ = require('lodash');

const freeEmailDomains = ['gmail.com', 'yandex.ru', 'hotmail.com'];

const getFreeDomainsCount = (emails) => {
  let res = [];
  res = emails.map((email) => {
    let [, domain] = email.split('@');
    return domain;
  });
  res = res.filter((domain) => freeEmailDomains.includes(domain));
  res = res.reduce((freeDomains, domain) => {
    console.log(domain);
    if(!_.has(freeDomains,domain)) {
      freeDomains[domain] = 0;
    }
    freeDomains[domain] += 1;
  },
  {});
  return res;
}


const emails = [
    'info@gmail.com',
    'info@yandex.ru',
    'info@hotmail.com',
    'mk@host.com',
    'support@hexlet.io',
    'key@yandex.ru',
    'sergey@gmail.com',
    'vovan@gmail.com',
    'vovan@hotmail.com',
];

getFreeDomainsCount(emails);