Emit cheatsheet

io.on('connection', onConnect);

functiononConnect(socket){

// sending to the client
 socket.emit('hello','can you hear me?',1,2,'abc');

// sending to all clients except sender
 socket.broadcast.emit('broadcast','hello friends!');

// sending to all clients in 'game' room except sender
 socket.to('game').emit('nice game',"let's play a game");

// sending to all clients in 'game1' and/or in 'game2' room, except sender
 socket.to('game1').to('game2').emit('nice game',"let's play a game (too)");

// sending to all clients in 'game' room, including sender
 io.in('game').emit('big-announcement','the game will start soon');

// sending to all clients in namespace 'myNamespace', including sender
 io.of('myNamespace').emit('bigger-announcement','the tournament will start soon');

// sending to a specific room in a specific namespace, including sender
 io.of('myNamespace').to('room').emit('event','message');

// sending to individual socketid (private message)
 io.to(socketId).emit('hey','I just met you');

// WARNING: `socket.to(socket.id).emit()` will NOT work, as it will send to everyone in the room
// named `socket.id` but the sender. Please use the classic `socket.emit()` instead.

// sending with acknowledgement
 socket.emit('question','do you think so?',function(answer){});

// sending without compression
 socket.compress(false).emit('uncompressed',"that's rough");

// sending a message that might be dropped if the client is not ready to receive messages
 socket.volatile.emit('maybe','do you really need it?');

// specifying whether the data to send has binary data
 socket.binary(false).emit('what','I have no binaries!');

// sending to all clients on this node (when using multiple nodes)
 io.local.emit('hi','my lovely babies');

// sending to all connected clients
 io.emit('an event sent to all connected clients');

};