Explain to a non-technical recruiter what the Chat Example (above) does.
It shows which clients different functions reach.
What proof of life are we getting on the backend from the above app?
Initial connection is received through io.on(“connection”), then further events are received and responded to using these commands.
Socket.IO gives us the i0.emit() method to send an event to everyone. What flag would you use if you want to send a message to everyone except for a certain emitting socket?
// 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.
What is a room and how might a room be useful?
A room is an arbitrary channel that sockets can join and leave. It can be used to broadcast events to a subset of clients.
How do you join a room?
io.on(“connection”, (socket) => {
socket.join(“some room”);
});
how do you leave a room?
socket.leave(‘roomName’);
What is a Namespace and what does it allow you to do?
A Namespace is a communication channel that allows you to split the logic of your application over a single shared connection (also called “multiplexing”).
Each namespace potentially has its own what? (hint: 3 things)
event handlers, rooms, middlewares
Discuss a possible use case for separate namespaces
You want to create a special namespace that only authorized users have access to, so the logic related to those users is separated from the rest of the application