Rauschmayer Axel. Deep JavaScript: Theory and techniques

Exploringjs.com, 2020. — 226 p. — ISBN: n/a.Update 2020-07-02This book dives deeply into JavaScript:
It teaches practical techniques for using the language better.
It teaches how the language works and why. What it teaches is firmly grounded in the ECMAScript specification (which the book explains and refers to).
It covers only the language (ignoring platform-specific features such as browser APIs) but not exhaustively. Instead, it focuses on a selection of important topics.