Node

Question 1

What does server-side programming allow us to do?

Answer 1

• Deliver tailored content to individual users
• Provides access to the underlying OS features, not usually available to client-side code.
• Helps choose which content to render.
• Can be written in any programming language.

Question 2

What does client-side programming allow us to do?

Answer 2

• Helps define content and presentation

Question 3

Why do programmers use web frameworks?

Answer 3

Web frameworks provide solutions to common problems (e.g., session management, authentication, data management)

Question 4

What is

Node.js

Answer 4

Node.js is an open-source runtime environment for executing JavaScript outside the browser.

Developers can write server-side code in JavaScript.

Question 5

What kind of architecture is Node.js?

Answer 5

Single-threaded event loop architecture

Question 6

What is a

Single Threaded Event Loop Architecture

Answer 6

One process sequentially executes incoming requests and returns a response.

Question 7

What is a

Multi-Threaded Request-Response Architecture

Answer 7

Every incoming request executes on a separate thread.

Question 8

What does the Event Loop do?

Answer 8

• It processes requests from the event loop sequentially.
• If a request uses blocking operations, a new thread handles them, and the next request begins.
• Otherwise, the request is processed, and a response is returned.

Question 9

What is nodemon used for?

Answer 9

Nodemon is used to automatically restart the app when you make changes.

Question 10

When we write scripts that will never terminate, how should we terminate them?

There are two options.

Answer 10

• Forcefully kill it (Not good)
• Exit gracefully (Good)

Question 11

What is the process module useful for?

Answer 11

The process module is useful for reading arguments passed to a script from the command line.

Question 12

What happens in the

Message/Callback Queue

Answer 12

Asynchronous operations schedule their callbacks to be executed when the Event Loop reaches the appropriate phase.
* Executed after functions in the call stack are executed.
* Callbacks are executed in order (FIFO) unless microtasks interrupt.

Question 13

What is a

Promise

Answer 13

It is an object that resolve before a function ends are executed right after the current function.