socket.io get rooms which socket is currently in

Question

Is it possible to get rooms which socket is currently in, without calling

io.sockets.clients(roomName)

for every room name and looking for

Answer 1

Update: Socket.io 3.0 Released

---

With 3.x Socket.rooms is Set now, which means that values in the rooms may only occur once.

Structure example: Set(4) {"", "room1", "room2", "room3"}

io.on("connect", (socket) => {
  console.log(socket.rooms); // Set {  }
  socket.join("room1");
  console.log(socket.rooms); // Set { , "room1" }
});

To check for specific room:

socket.rooms.has("room1"); // true

More about Set and available methods: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

Migration Docs: https://socket.io/docs/migrating-from-2-x-to-3-0/