socket.io send message to specific client, and remove item from array.

socket.client.js

      
// remove a room key
client.on('disconnect', function (data) {                                         
  var key = room.indexOf(client.id);;                                             
  room.splice(key, 1);                                                            
  io.sockets.socket(adminId).emit('query-room-list', room);                                                                                                               
 });