getify/You-Dont-Know-JS resource
A book series (2 published editions) on the JS language. observed · 2026-08-28
Health v2 · maintenance only
62/100
- Activity 67
- Release rhythm 35
- Longevity 100
Flags: no_releases no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4674
- days_rel: n/a
- days_push: 199
- n_releases_24m: 0
Adoption not part of the score
184741 stars · 33428 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
A free, open-source book series by Kyle Simpson diving deep into the core mechanisms of the JavaScript language, with two published editions. The second edition is complete and readable online, with purchasable ebook/print versions.
Use cases
- learn javascript deeply
- understand closures and scope in js
- study javascript prototypes and this
- learn async javascript patterns
- free javascript books online
- prepare for javascript interviews
When to choose
- you want a deep, mechanism-level understanding of JavaScript rather than framework tutorials
- you prefer free, self-paced reading material
- you are teaching or training developers on JS fundamentals
When to avoid
- you need a quick reference or API documentation
- you want coverage of specific frameworks like React or Vue
- you need beginner-friendly interactive exercises instead of prose
Facets
learning-resource · maturity stable
documentation developer-tools programming-languages tutorials web-development education javascript book-series closures prototypes async es6 free-online-books web-server
2 sources
- readme: https://github.com/getify/You-Dont-Know-JS · fetched 2026-08-28 · 97fb91d01473
- homepage: https://www.amazon.com/dp/B085XXCJ7X · fetched 2026-08-28 · 6d1d7ac1af17
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| getify/You-Dont-Know-JS | main | 62 |
For agents
markdown · JSON · MCP: product_card(name="getify/You-Dont-Know-JS")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem