Room and namespace concepts in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new namespace using Socket.IO.

Node.js

const io = require('socket.io')(server);
const chatNamespace = io.of('[1]');

Drag options to blanks, or click blank then click option'

A/chat

Bchat

Cnamespace

D/room

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the leading slash in the namespace name.

Using a room name instead of a namespace.

Namespaces in Socket.IO start with a slash, like /chat.

2fill in blank

medium

Complete the code to join a client socket to a room named 'lobby'.

Node.js

io.on('connection', (socket) => {
  socket.[1]('lobby');
});

Drag options to blanks, or click blank then click option'

AconnectRoom

BjoinRoom

Center

Djoin

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names like 'joinRoom' or 'enter'.

Trying to use 'connectRoom' which does not exist.

The method to join a room is join.

3fill in blank

hard

Fix the error in broadcasting a message to all clients in a room 'game'.

Node.js

io.to('game').[1]('start', { msg: 'Game begins!' });

Drag options to blanks, or click blank then click option'

AemitToRoom

Bbroadcast

Cemit

DsendToRoom

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'emitToRoom' or 'sendToRoom'.

Using 'broadcast' incorrectly here.

The correct method to send an event is emit.

4fill in blank

hard

Fill both blanks to create a namespace '/chat' and join a room 'general' inside it.

Node.js

const chat = io.of('[1]');
chat.on('connection', (socket) => {
  socket.[2]('general');
});

Drag options to blanks, or click blank then click option'

A/chat

Bjoin

Cconnect

D/general

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'connect' instead of 'join' to enter a room.

Omitting the slash in the namespace name.

Namespaces start with a slash, so '/chat' is correct. To join a room, use join.

5fill in blank

hard

Fill all three blanks to emit a message 'hello' to all clients in room 'room1' inside namespace '/news'.

Node.js

const news = io.of('[1]');
news.to('[2]').[3]('message', 'hello');

Drag options to blanks, or click blank then click option'

A/news

Broom1

Cemit

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'send' instead of 'emit' to send events.

Omitting the slash in the namespace name.

Namespace is '/news', room is 'room1', and the method to send is 'emit'.