Exploring ES6 VS Hacking with React

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Comprehensive Coverage
Exploring ES6 provides an exceptionally thorough and detailed exploration of ES6 (ECMAScript 2015) features, covering everything from arrow functions and template literals to generators, proxies, and modules, making it one of the most complete references available for the specification.
Free to Read Online
The book is available to read for free online through Leanpub, making it highly accessible to developers of all backgrounds and financial situations who want to learn modern JavaScript.
In-Depth Explanations
Dr. Axel Rauschmayer is known for his deep, technically precise explanations. The book goes beyond surface-level tutorials and explains the 'why' behind design decisions in ES6, helping readers gain a genuine understanding of the language mechanics.
Well-Structured Organization
The book is organized into logical chapters that each focus on a specific ES6 feature or concept, making it easy to use both as a sequential learning resource and as a reference guide that you can jump into at any point.
Authoritative Source
Written by Dr. Axel Rauschmayer, a highly respected JavaScript expert and blogger, the content is reliable, accurate, and well-researched, drawing directly from the ECMAScript specification itself.

Overwhelming Detail
The level of detail can be overwhelming for beginners or intermediate developers. The book sometimes dives into specification-level minutiae that may not be practical for everyday development, making it hard to distinguish essential knowledge from edge cases.
Dated Content
Since the book focuses specifically on ES6 (2015), it does not cover subsequent ECMAScript updates (ES2016–ES2024) such as async/await, optional chaining, nullish coalescing, and other modern features that are now standard in JavaScript development.
Dense and Academic Writing Style
The writing style can be quite academic and dense, which may make it less engaging or harder to follow compared to more conversational or example-driven JavaScript books. Some readers may find it dry.
Limited Practical Examples
While the book excels at explaining concepts theoretically, it can sometimes lack real-world, practical project-based examples that show how ES6 features are used together in actual application development scenarios.
Length Can Be Intimidating
The book is extremely long and extensive, which can be intimidating for readers who want a quick, concise introduction to ES6. It may take significant time commitment to work through the entire book.

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Exploring ES6 by Dr. Axel Rauschmayer is an excellent, in-depth resource for understanding modern JavaScript (ECMAScript 6/ES2015) with clear explanations and practical examples.

Written by Dr. Axel Rauschmayer, a well-respected JavaScript expert and educator
Provides thorough, detailed coverage of ES6 features with accurate technical explanations
Available to read for free online, making it accessible to everyone
Includes practical code examples that clarify complex concepts
Well-organized structure that lets you jump to specific topics as needed
Explains not just how features work but the reasoning and design decisions behind them

JavaScript developers wanting to master modern ES6 features
Programmers transitioning from ES5 to ES6/ES2015
Developers who prefer a reference-style book they can consult topic-by-topic
Self-learners who want a free, comprehensive resource
Experienced coders seeking deep understanding rather than surface-level tutorials