gistfile1.txt

var sensitive = [
 {
   email: someemail@gmail.com,
   secret: 'somesecret',
   username: name,
   last_message: 'hey'
 },
 {
   email: someemail1@gmail.com,
   secret: 'somesecret2',
   username: name1,
   last_message: 'hey2'
 }
];

var filtered = _.map(sensitive, function(s){
  // Transform, leave out sensitive data
  return {
    username: s.username,
    last_message: s.last_message
  }
});

// Filter sockets using underscore.js collections
_(sockets).select(function(socket){
  return socket.user.role == 'Member';
}).each(function(socket){
  socket.send(filtered);
});

_(sockets).select(function(socket){
  return socket.user.role == 'Admin';
}).each(function(socket){
  socket.send(sensitive);
});