You Don't Know JS

A book series on JavaScript


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.

NOTE: The current edition (2nd) of the book series is a WORK IN PROGRESS, and can be found here. The finished previous edition (1st) can be found here.

Premier Sponsor

This edition of the YDKJS(Y) book series is exclusively sponsored by Frontend Masters.

Frontend Masters is the gold standard for top-of-the-line expert training material in frontend-oriented software development. With over 150 courses on all things frontend, this should be your first and only stop for quality video training on HTML, CSS, JS, and related technologies.

I teach all my workshops exclusively through Frontend Masters. If you like this book content, please check out my video training courses.

I want to extend a warm and deep thanks to Marc Grabanski and the entire Frontend Masters team, not only for their excellent work with the video training platform, but for their unwavering support of me and of the "You Don't Know JS" books!


I recommend reading the second-edition books in this order:


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: