A function that when given a URL as a string, parses out just the domain name and returns it as a string.

app.js

function domainName(url) {
  // Remove protocol and www. prefix from domain
  let domain = url.replace(/(https?:\/\/)?(www\.)?/, '');

  // Remove everything after the first dot (including the dot)
  domain = domain.split('.')[0];

  return domain;
}


console.log(domainName("http://github.com/carbonfive/raygun")); // "github"
console.log(domainName("http://www.zombie-bites.com")); // "zombie-bites"
console.log(domainName("https://www.cnet.com")); // "cnet"
console.log(domainName("http://www.google.com")); // "google"