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 this socket in results

Answer 1

In socket.io version 1+ the syntax is:

socket.rooms 

Answer 2

Cross-compatible way

var rooms = Object.keys(io.sockets.adapter.sids[socket.id]); // returns [socket.id, 'room-x'] or [socket.id, 'room-1', 'room-2', ..., 'room-x']