Changelog

Updates to Bun for Beginners — new sections added, errata corrected. If you already own the book, this is the page to check when you want to know what's worth re-reading.

2026-05-14

• Chapter 00 — Introduction. Added a new section, Local Development and Real Websites, explaining the difference between running the app on your own computer and running it on a public server.
• Chapter 04 — Test What You Built. Rewrote the See a Failing Test exercise. The old version asked you to change the expected value to a wrong number; the new version has you temporarily break countWords with text.split(" ") and watch the test catch a real multi-space bug.
• Chapter 05 — Routes, Layout, and Static Files. Fixed the reported test count (was “11 tests,” now “5 tests”) so the text matches what you actually see when you run the suite.