You Don't Know JS Yet (book series) - 2nd Edition

This is a series of books diving deep into the core mechanisms of the JavaScript language. This is the second edition of the book series:

     

To read more about the motivations and perspective behind this book series, check out the Preface.

If you're looking for the previous first edition books, they can be found here.

Titles

I recommend reading the second edition books in this order:

• Get Started | Buy on Leanpub | Buy on Amazon
• Scope & Closures | Buy on Leanpub | Buy on Amazon
• "The Unbooks" (ebook) | Buy on Leanpub | Buy on Amazon
  • Objects & Classes (draft stable)
  • Types & Grammar (rough draft)
  • Sync & Async (canceled)
  • ES.Next & Beyond (canceled)

If you're looking for the previous first edition books, they can be found here.

Publishing

As always, you'll be able to read these books online here entirely for free.

This edition of the books is being self-published through GetiPub publishing. The published books will be made available for sale through normal book retail sources.

If you'd like to contribute financially towards the effort (or any of my other OSS efforts) aside from purchasing the published books, please consider these options:

• Github Sponsorship
• Patreon
• Paypal

Contributions

This book series is now complete, and is not open to further contributions.

Thank you to those who've been part of the 11 years journey of this book series.

Thank You To These Wonderful Sponsors

A big thanks to Coddy, our latest Project Champion sponsor!

Coddy is a fantastic resource to learn coding for free in a fun an interactive way. Go check them out!

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The first two books of the second edition were generously sponsored by Frontend Masters, which is now **Master.dev.

Note: I previously taught all my workshops exclusively through Frontend Masters (now Master.dev). If you like this book content, please check out my video training courses.

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License & Copyright

The materials herein are all © 2019-2025 Kyle Simpson.

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 Unported License.