initializer.js

// `config.room` is a random ID generated on page load.
var socket = io();

TicTacToe.prototype.init = function(config) {
  this.room = config.room;
};

TicTacToe.prototype.eventListeners = function() {
  socket.on('connect', this.onSocketConnect.bind(this));
  socket.on('dispatch', this.onSocketDispatch.bind(this));
});

// Notify socket.io that a new room has been created
TicTacToe.prototype.onSocketConnect = function(data) {
  socket.emit('room', this.room);
};

// When another player sends an action do the server,
// apply it to the client.
TicTacToe.prototype.onSocketDispatch = function(data) {
  store.dispatch(data);
});