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1. About this book

This book is about two versions of JavaScript:

• ECMAScript 2018 and
• ECMAScript 2019 It only covers what’s new in those versions. For information on other versions, consult my other books, which are free to read online, at ExploringJS.com.

1.1. Feedback and corrections

There is a link at the end of each chapter of the online version of this book that enables you to comment on that chapter.

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