gistfile1.txt

var users = [];

io.sockets.on('connection', function(socket)
{
    users.push(socket);

    socket.on('setUsername', function(data)
    {
        socket.username = data;
    });

    socket.on('sendMessage', function(message)
    {
        var data = {message: message,
                    username: socket.username,
                    datetime: new Date().toISOString()};
        socket.broadcast.emit('message', data);
        console.log(data.username + ": " + data.message);
    });

    socket.on('disconnect', function () {
        console.log(socket.username, " disconnected");
        delete users[users.indexOf(socket)];
    });
});