Reader Guide

How to use Good Code Bad Code

Use the Example Library to practice reading code like a reviewer: choose a Track, compare the examples, then keep the Takeaway for your next review.

Start in three steps

Choose the language, framework, runtime, tool, or styling system you want to review.

Read Good Code and Bad Code side by side before opening the explanation in your head.

Use the Review Notes and Takeaways as a short checklist for future code reviews.

Pause before reading the notes. Ask what changed, what risk it reduces, and whether the same pattern appears in your own codebase.

The preferred version that makes the review habit visible in code.

A version with a review issue or trade-off that may still run but is harder to maintain.

A short explanation connecting the code difference to the review signal.

A compact habit to remember after you leave the lesson.

Pause before reading the notes. Ask what changed, what risk it reduces, and whether the same pattern appears in your own codebase.