sort() {
    this._index = 0;
    this._isMore = true;

    while (this._isMore) {
      this._isMore = false;
      this._collections.forEach(this._addArticle.bind(this));
      this._index++;
    }

    return this._articles;
  }
/**
   * Performs a sort over all of the article collections
   *
   * @returns {Array} - Array of all articles in sorted order
   */
Performs a sort over all of the article collections
@returns {Array} - Array of all articles in sorted order
Performs a sort over all of the article collections @returns { Array } - Array of all articles in sorted order
sort() {
    this._index = 0;
    this._isMore = true;
    while (this._isMore) {
      this._isMore = false;
      this._collections.forEach(this._addArticle.bind(this));
      this._index++;
    }
    return this._articles;
  }
sort ( ) { this . _index = 0 ; this . _isMore = true ; while ( this . _isMore ) { this . _isMore = false ; this . _collections . forEach ( this . _addArticle . bind ( this ) ) ; this . _index ++ ; } return this . _articles ; }
Performs a sort over all of the article collections
 @returns {Array} - Array of all articles in sorted order
Performs a sort over all of the article collections @returns { Array } - Array of all articles in sorted order