socketCHEATSHEET.txt

SERVER SEND
-send event to client
	io

-send to EVERY client
	io.emit

-send to ONE client
	io.to(sockedId).emit

SERVER RECEIVE from client

socket.on(eventName, data => {
  console.log(data)
})

EXAMPLE THAT HAS CALLBACK FROM CLIENT

socket.on(EVENT, (user, callback) => {
	if(user) 
		callback({error: 'user taken'})
	else {
  		callback({error: false})
	}	
})
---------------------------------
CLIENT
-SEND TO SERVER

//callback gets executed on FRONTEND after response from server
socket.emit(event, data, [callback])

-RECEIVE FROM SERVER
socket.on