when does client leave room socket.io code example

Example 1: socket emit to specific room using nodejs socket.io

io.on('connection', socket => {  socket.on('say to someone', (id, msg) => {    socket.to(id).emit('my message', msg);  });});

Example 2: socket emit to specific room using nodejs socket.io

io.to('room1').to('room2').to('room3').emit('some event');