client.html

<script src="http://localhost:3000/socket.io/socket.io.js"></script>
 
<script>
    var news = io.connect('http://localhost:3000/').of('/news');

    news.emit("raul", new Array("1","2","3","4","5","6","7","8","9","10") );

    news.on('get_random_number_from_raul', function(data) {
        console.log('random', data);
    });

    news.emit("createroom", "x");

    news.on("created", function(data) {
        console.log('created', data);
    });
</script>

server.js

var io = require('socket.io').listen(3000);

var news = io.of('/news').on('connection', function (socket) {

	socket.on('raul', function(data){
		var rand = data[Math.floor(Math.random() * data.length)];
        console.log('random', rand);
		news.emit("get_random_number_from_raul", rand);
	});

	socket.on("createroom", function (room) {
		socket.join(room);
		console.log('created', room);
		socket.broadcast.to(room).emit("created", room);
	});
});