Room socket.io?

Question

JavaScript

Just started to study work with sockets, it's not clear yet.
The following picture is drawn in my head:
Server:

var io = require( 'socket.io' )( http );
io.sockets.on( 'connection', function( socket ) {
    socket.to( 'room_1' ).emit( 'msg', 'text' );
} );

Customer:

var socket = io( 'http://examle.loc/' );
socket.on( 'msg', function( msg ) {
       console.log( msg );
} );

And in theory, a message should already be displayed in the console (as I read from the documentation).
But alas...
Can I get a short, but at the same time, a valuable guide on how to work with rooms in socket.io?

Answer 1

It will be displayed as soon as you send it to the client, or to all clients.
You send a message to room_1, but no one enters it.
To get it, the client needs to join in the right room.
Or do emit/broadcast,