Question 1

How do I handle errors in Node.js callbacks?

Accepted Answer

The guide explains the error-first callback pattern: pass an error object as the first argument if something goes wrong, otherwise use null. This is standard in Node for async operations like file reads, ensuring robust error handling in I/O tasks.

Question 2

What's the difference between events and callbacks in Node.js?

Accepted Answer

Callbacks are for one-to-one relationships, where a function executes after an async operation. Events use the observer pattern for many-to-many, allowing multiple listeners to subscribe, like in chat servers for 'message' events, making them more scalable for real-time applications.

Question 3

How can I use npm modules in a browser?

Accepted Answer

Use Browserify to convert Node modules into browser-compatible code, as shown in the guide with RequireBin examples. This lets you require() npm modules client-side, enabling code reuse across server and browser environments.

Question 4

Is Node.js good for CPU-intensive tasks like image processing?

Accepted Answer

No, Node.js is designed for I/O-bound operations and may struggle with CPU-heavy tasks due to its single-threaded event loop. The guide emphasizes its strengths in networks and file systems, suggesting offloading computation to other tools or workers.

Question 5

How do I choose the right npm module from so many options?

Accepted Answer

Check for recent updates, GitHub activity, README clarity, and license compatibility. The guide advises evaluating code simplicity and dependencies, like comparing pdftotextjs and pdf-text-extract, to avoid bloat and ensure maintainability.

Question 6

What are streams in Node.js and why are they useful?

Accepted Answer

Streams provide a unified API for handling data in chunks, efficient for large files or network data. They reduce memory usage by processing data incrementally, which is key for performance in I/O-heavy applications like video streaming or log processing.

The Art of Node

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