eyeofmidas.com/htdocs/js/GameState.js

if(MIDAS == undefined) {
	var MIDAS = {};
}
MIDAS.GameState = function(gameConsole) {
    var self = this;
	var commands = ["say", "look", "exits", "go"];
    var commandsDescription = [
        "Your character speaks whatever you type"
        , "Gathers information about your current surroundings"
        , "Lists all of the ways out of the room"
        , "Moves in the specified direction"
    ];

    var rooms = [ {"id" : 0, "name" : "The Void" , "description" : "Nothing but swirling mist in the blackness.", "exits" : []},
        {"id" : 1, "name" : "Entry Hall", "description" : "The ceiling of the hall is vaulted, with light streaming in through the stained glass windows on either side.", "exits" : [{"command" : "north", "target" : 2, "action" : "You move north."}]}
        ,{"id" : 2, "name" : "Grand Ballroom", "description" : "The cool marble floors glisten with the candlight of the crystal chandeliers above.", "exits" : [{"command" : "south", "target" : 1, "action" : "You waltz south."}]}
        ];

    var playerPosition = 1;

    this.getCommandList = function() {
        return commands;
    };

    this.getCommandDescriptions = function() {
        return commandsDescription;
    };  
  
    this.handleCommandInput = function(commandObject) {
        switch(commandObject.command) {
			case commands[0]:
		    	gameConsole.output("You said \"" + commandObject.data.join(" ") + "\"");
			break;
			case commands[1]:
				gameConsole.output(rooms[playerPosition].name);
				gameConsole.output(rooms[playerPosition].description);
			break;
            case commands[2]:
                var exitsList = [];
                if(rooms[playerPosition].exits.length == 0) {
                    gameConsole.output("There are no obvious exits.");
                } else {
                    for(var i = 0; i < rooms[playerPosition].exits.length; i++) {
                        exitsList.push(rooms[playerPosition].exits[i].command);
                    }
                    gameConsole.output("There are exits to the " + exitsList.join(", "));
                }
            break;
            case commands[3]:
                var exit = {};
                for(var i = 0; i < rooms[playerPosition].exits.length; i++) {
                    if(commandObject.data[0] == rooms[playerPosition].exits[i].command){
                        exit = rooms[playerPosition].exits[i];
                    }
                }
                console.log(exit);
                if (exit.target) {
                    gameConsole.output(exit.action);
                    playerPosition = exit.target;
                    gameConsole.output(rooms[playerPosition].name);
				    gameConsole.output(rooms[playerPosition].description);
                } else {
                    gameConsole.output("I don't see that exit.");                    
                }
            break;
        }
    };
};