exmp.js

// Logged User can access they feed
var LoggedUser =  {
	neewsFeed: function() {
		console.log('/feed');
		// return redirect('/feed')
	}
}

// Let's represent the absence of an credential user
// https://en.wikipedia.org/wiki/Null_Object_pattern
var guestUser =  {
	neewsFeed: function() {
		console.log('/login');
		// return redirect('/login');
	}
}


// Dispatch function based on user credentials
function userFactory(login, pass) {
	if(login === 'user' && pass === 123) {
		return LoggedUser;
	}
	
	return guestUser;
}

// This allow us to create generic methods!
// I don't want know if I have an logged user or not,
// just give-me an object to send messages
userFactory('user', 123).neewsFeed();
userFactory('', '').neewsFeed();