CircularJSON w/ Type Information

circular_json_with_type_information.js

var CircularJSON  = require('circular-json');
var jsdom         = require("jsdom"); 
var $             = require("jquery")(jsdom.jsdom().createWindow()); 

var print    = console.log;

var LocalStorage = {
  store:   {},
  setItem: function (key, value) {
    this.store[key] = CircularJSON.stringify(value);
  },
  getItem: function (key, Proto) {
    var result = JSON.parse(this.store[key]);
    return key === Proto.name.toLowerCase() ? reviveFromJSONResult(result, Proto) : result;
  }
};

function Room(name, description){
  this.description = description;
  this.roomItems = [/*array of items randomly set*/];
  this.exits = [/*array of rooms set */];
}

var Player = function Player(startroom){
  this.currentRoom = startroom; //this is a room
  this.playerItems = [/* An array of Items */]; 
}
var isPlayer = Player.isPrototypeOf.bind(Player);

var localStorage = Object.create(LocalStorage);
var player       = null;

function startGame() {
  player = new Player(new Room('Home', 'My favorite place to code at night.'));
  player.player = player;
}

function saveGame(){  
  player.lastsave = new Date().toISOString();
  localStorage.setItem('player', player);
}

function loadGame() {
  player =  localStorage.getItem('player', Player);
}

function reviveFromJSONResult(result, Proto) {
  var value = Object.create(Proto);
  for (var key in result) {
    value[key] = result[key];
  }
  value[Proto.name.toLowerCase()] && (value[Proto.name.toLowerCase()] = value);
  return value;
}

startGame();
saveGame();
player = null
loadGame();

print(player === player.player, isPlayer(player), isPlayer(player.player));
// true true true