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This is a series of books diving deep into the core mechanisms of the JavaScript language.

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

This edition of theYDKJS book series is exclusively sponsored byFrontend 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 teachall 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 books in this order:

• Get Started
• Scope & Closures
• Objects & Classes
• Types & Grammar
• Sync & Async
• ES.Next & Beyond

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

This edition of the books is being self-published throughGetiPub 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

Please feel free to contribute to the quality of this content by submitting PRs for improvements to code snippets, explanations, etc. While typo fixes are welcomed, they will likely be caught through normal editing/publishing processes,so please don't worry about them right now.

Any contributions you make to this effortare of course greatly appreciated.

ButPLEASE read theContributions Guidelines carefully before submitting a PR.

The materials herein are all © 2019-2020 Kyle Simpson.

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