Different destination groups for socket.io emit and broadcast functions

socket.io-emit-broadcast-usage.js

// send to current request socket client
socket.emit('message', "this is a test");
 
// sending to all clients, include sender
io.sockets.emit('message', "this is a test");
 
// sending to all clients except sender
socket.broadcast.emit('message', "this is a test");
 
// sending to all clients in 'game' room(channel) except sender
socket.broadcast.to('game').emit('message', 'nice game');
 
// sending to all clients in 'game' room(channel), include sender
io.sockets.in('game').emit('message', 'cool game');
 
// sending to individual socketid
io.sockets.socket(socketid).emit('message', 'for your eyes only');