websocket emit to others in socket.io 2 code example

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

io.on('connection', function(socket){  socket.to('some room').emit('some event');});

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

io.on('connection', socket => {  socket.on('disconnecting', () => {    const rooms = Object.keys(socket.rooms);    // the rooms array contains at least the socket ID  });  socket.on('disconnect', () => {    // socket.rooms === {}  });});