The world's most basic socket.io AngularJS factory

socket.js

appServices.factory('socket', function ($rootScope) {
    var socket = io.connect('http://localhost:3000');
    return {
        on: function (eventName, callback) {
            socket.on(eventName, function () {
                var args = arguments;
                $rootScope.$apply(function () {
                    callback.apply(socket, args);
                });
            });
        }
    };
});