/**
 * Is current user logged in ?
 *
 * @returns {boolean}
 *   True if the user is logged in, false otherwise.
 */
isLoggedIn = () => {
  return !!Meteor.userId();
};

/**
 * Convert a document to a string containing its unique words.
 *
 * @param {Object} doc
 *   The source Website document. Extraction uses title and description only.
 * @returns {string}
 *   A string made of the lower-case, orderd, deduplicated words in the document.
 */
toWords = (doc) => {
  const NONWORD_REGEX = /[\W]/g;
  const aTitle = doc.title.split(NONWORD_REGEX);
  const aDescription = doc.description.split(NONWORD_REGEX);
  const aWords = aTitle.concat(aDescription);
  const aLCWords = aWords.map(function (s) { return s.toLocaleLowerCase(); });
  const aDWords = _.uniq(aLCWords);
  const aDSWords = aDWords.sort();
  const result = aDSWords.join(" ").trim();
  Meteor._debug(doc, result);
  return result;
};