using pipe

functions.js

const getDomainName = (item) => item.details.name;
const getProtocol = (item) => (item.details.valid ? 'https' : 'http');
const getUrl = (item) => `${getProtocol(item)}://${getDomainName(item)}`;
// TODO: (temporary) Adding callback=true because server side redirection needs this parameter
const addCallbackParameter = (url) => `${url}?callback=true`;

const generateUrl = (item) => {
  const url = getUrl(item);
  const urlWithCallbackParameter = addCallbackParameter(url);
  return urlWithCallbackParameter;
};

// The above function can be simplified or created using pipe utility function from ramda.
const generateUrl = R.pipe(getUrl, addCallbackParameter);

const urlList = domainList.map(generateUrl);