pinger-promise.js

const servers = [
  'http://www.sevengramscaffe.com',
  'http://www.hernanparra.co',
  'http://www.thetimeandyou.com',
  'http://www.luchoycarmelo.com'
 ];
pingServers(servers).then( function (failedServers) {
  for (const url in failedServers) {
    console.log(`${url} failed ${failedServers[url]} times`);
  }
});