Top 100 Socket.IO Courses and Q&A

Learning Socket.IO courses involves gaining expertise in a library that enables real-time, bidirectional, and event-based communication between web clients and servers.

Socket.IO simplifies the implementation of WebSocket-based applications, providing a seamless and reliable connection channel for data exchange.

The advantages of learning Socket.IO are multifaceted. Firstly, it facilitates the creation of real-time applications such as chat applications, multiplayer games, collaborative tools, and live tracking systems.

Secondly, Socket.IO offers cross-browser compatibility, allowing applications to function consistently across various web browsers and devices.

Additionally, it supports both server-side and client-side development, enabling developers to build robust, scalable, and responsive applications.

Understanding Socket.IO equips individuals with the skills to implement responsive and interactive features, enhancing user experience and fostering innovation in web application development.

Moreover, mastering Socket.IO paves the way for exploring advanced functionalities and architecting modern, real-time applications in the evolving landscape of web development.


Here are top assorted 100 courses for Socket.IO with special discounted pricing from Udemy.

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here are 20 multiple-choice questions (MCQs) related to learning Socket.IO along with their respective answers:

Question: What is Socket.IO primarily used for?

A) Server-side rendering
B) Real-time bidirectional communication
C) Asynchronous programming
D) HTML templating
Answer: B) Real-time bidirectional communication
Question: Which protocol does Socket.IO primarily use for communication?

A) HTTP
B) TCP/IP
C) WebSocket
D) FTP
Answer: C) WebSocket
Question: Which programming languages can use Socket.IO for communication?

A) Only JavaScript
B) Only Python
C) JavaScript, Python, and more
D) Only Ruby
Answer: C) JavaScript, Python, and more
Question: Which method in Socket.IO is used to establish a connection with the server?

A) connect()
B) open()
C) emit()
D) on()
Answer: A) connect()
Question: What event is fired when a client successfully connects to the Socket.IO server?

A) connection
B) connected
C) connect
D) socketConnected
Answer: C) connect
Question: Which method is used to emit an event from the server to all connected clients in Socket.IO?

A) emit()
B) send()
C) broadcast()
D) io.emit()
Answer: D) io.emit()
Question: In Socket.IO, what does the ’emit’ function do?

A) Listens for events from the server
B) Sends an event to the server
C) Broadcasts an event to all clients
D) Emits an event to the client or server
Answer: D) Emits an event to the client or server
Question: Which method is used to handle incoming events on the server side in Socket.IO?

A) on()
B) listen()
C) receive()
D) handle()
Answer: A) on()
Question: What does the ‘disconnect’ event indicate in Socket.IO?

A) Client-side disconnection
B) Server shutdown
C) Connection timeout
D) Server-side disconnection
Answer: A) Client-side disconnection
Question: Which Socket.IO method is used to disconnect a client from the server?

A) disconnect()
B) removeClient()
C) leave()
D) close()
Answer: A) disconnect()
Question: How is data sent using Socket.IO?

A) As text only
B) As binary data only
C) As JSON objects
D) As XML
Answer: C) As JSON objects
Question: Which method is used to broadcast to all clients except the sender in Socket.IO?

A) emit()
B) send()
C) broadcast.emit()
D) io.broadcast()
Answer: C) broadcast.emit()
Question: Which event is emitted when an error occurs in Socket.IO?

A) socketError
B) error
C) socket.io.error
D) onError
Answer: B) error
Question: Which method is used to create a Socket.IO server in Node.js?

A) io()
B) createServer()
C) socketServer()
D) socketIO()
Answer: A) io()
Question: What is the default Socket.IO port?

A) 80
B) 8080
C) 3000
D) 8000
Answer: B) 8080
Question: What does the ‘namespace’ feature in Socket.IO allow you to do?

A) Group and organize sockets
B) Create private connections
C) Define different message types
D) Set up secure connections
Answer: A) Group and organize sockets
Question: Which method in Socket.IO is used to join a specific room?

A) join()
B) connectToRoom()
C) room()
D) enter()
Answer: A) join()
Question: What does the ‘rooms’ feature in Socket.IO allow you to do?

A) Limit the number of connected clients
B) Group connected sockets together
C) Define different namespaces
D) Encrypt communication between client and server
Answer: B) Group connected sockets together
Question: Which event is emitted when a client joins or leaves a room in Socket.IO?

A) roomChange
B) joinRoom
C) roomUpdate
D) join/leave
Answer: D) join/leave
Question: How does Socket.IO handle real-time communication compared to traditional HTTP?

A) Uses long-polling for communication
B) Uses asynchronous event-based communication
C) Requires constant polling for data
D) Utilizes RESTful APIs
Answer: B) Uses asynchronous event-based communication