text: 'use strict';
  
  /**
   * A ResultSet contains a list or results
   * @param {Array} entries
   * @constructor
   */
  function ResultSet(entries) {
    if (!(this instanceof ResultSet)) {
      throw new SyntaxError('Constructor must be called with the new operator');
    }
  
    this.entries = entries || [];
  }
  
  /**
   * Returns the array with results hold by this ResultSet
   * @returns {Array} entries
   */
  ResultSet.prototype.valueOf = function () {
    return this.entries;
  };
  
  /**
   * Returns the stringified results of the ResultSet
   * @returns {String} string
   */
  ResultSet.prototype.toString = function () {
    return '[' + this.entries.join(', ') + ']';
  };
  
  /**
   * Get a JSON representation of the ResultSet
   * @returns {Object} Returns a JSON object structured as:
   *                   `{"mathjs": "ResultSet", "entries": [...]}`
   */
  ResultSet.prototype.toJSON = function () {
    return {
      mathjs: 'ResultSet',
      entries: this.entries
    };
  };
  
  /**
   * Instantiate a ResultSet from a JSON object
   * @param {Object} json  A JSON object structured as:
   *                       `{"mathjs": "ResultSet", "entries": [...]}`
   * @return {ResultSet}
   */
  ResultSet.fromJSON = function (json) {
    return new ResultSet(json.entries);
  };
  
  module.exports = ResultSet;
  