Why worker threads matter in Node.js - Quick Recap

Recall & Review

beginner

What is the main reason to use worker threads in Node.js?

Worker threads allow Node.js to run JavaScript code in parallel, so heavy tasks don't block the main thread and slow down the app.

beginner

How do worker threads improve Node.js performance?

They let CPU-heavy tasks run in separate threads, so the main thread stays free to handle user requests and events smoothly.

intermediate

What problem do worker threads solve compared to the default Node.js model?

Node.js runs on a single thread by default, so long tasks block everything. Worker threads let you run tasks in parallel to avoid this blocking.

advanced

Can worker threads share memory in Node.js?

Yes, worker threads can share memory using SharedArrayBuffer, which helps them communicate efficiently without copying data.

intermediate

Why might you choose worker threads over child processes in Node.js?

Worker threads are lighter and faster because they share memory, while child processes are heavier and communicate via messaging only.

What is the main benefit of using worker threads in Node.js?

A Run CPU-heavy tasks without blocking the main thread

B Make HTTP requests faster

C Store data in a database

D Improve CSS styling

Worker threads let you run heavy tasks in parallel, so the main thread stays responsive.

How do worker threads communicate with the main thread?

A By sharing memory or sending messages

B By writing files to disk

C By opening new browser tabs

D By changing environment variables

Worker threads can share memory using SharedArrayBuffer or send messages to communicate.

Which Node.js feature runs JavaScript code on a single thread by default?

A HTTP server

B Worker threads

C Event loop

D Child processes

The event loop runs on a single thread, handling asynchronous tasks.

Compared to child processes, worker threads are:

A Heavier and slower

B Lighter and faster

C Exactly the same

D Not available in Node.js

Worker threads share memory and are lighter than child processes, which use separate memory.

Which of these is NOT a use case for worker threads?

A Running background tasks without blocking

B Running CPU-intensive calculations

C Performing image processing

D Handling multiple HTTP requests

Handling HTTP requests is usually done by the main thread; worker threads help with heavy background tasks.

Explain why worker threads matter in Node.js and how they help improve app performance.

Think about how a busy kitchen chef can get help to cook faster.

Describe the differences between worker threads and child processes in Node.js.

Compare sharing a room versus living in separate houses.