JavaScript Quiz VS Understanding ES6

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Engaging Learning Tool
JavaScript Quiz offers an interactive platform for users to reinforce their JavaScript knowledge through quizzes, making the learning process more engaging and effective.
Wide Range of Topics
The platform covers a broad spectrum of JavaScript topics, catering to different skill levels from beginners to advanced programmers.
Immediate Feedback
Users receive instant feedback on their answers, helping them learn from their mistakes quickly and understand the correct concepts.
Accessible Format
The web-based nature of the quizzes allows for easy access from different devices with no need for additional software installations.

Free to read online
The entire book is available to read for free on Leanpub's website, making it highly accessible to anyone who wants to learn ES6 without any financial commitment.
Comprehensive ES6 coverage
The book provides thorough coverage of all major ES6 features including destructuring, promises, proxies, symbols, iterators, generators, classes, and modules, making it a solid one-stop reference for the specification.
Written by a respected authority
Authored by Nicholas C. Zakas, a well-known and highly respected JavaScript developer and author of several influential JavaScript books, lending credibility and quality to the content.
Clear explanations with practical examples
The book excels at breaking down complex ES6 concepts into understandable explanations accompanied by practical code examples that illustrate how and why each feature should be used.
Well-organized structure
Each chapter focuses on a specific category of ES6 features, making it easy to use both as a sequential learning resource and as a reference guide to look up specific topics as needed.

Dated content
Published around 2016, the book does not cover any features introduced after ES6 (ES2015), such as async/await (ES2017), optional chaining, nullish coalescing, and other modern JavaScript additions, making it increasingly incomplete as a modern JS resource.
Assumes prior JavaScript knowledge
The book is targeted at developers who already have a solid understanding of ES5 JavaScript, which means beginners to JavaScript may struggle to follow along without first learning the fundamentals elsewhere.
Limited real-world application examples
While the book explains individual features well, it sometimes lacks larger, real-world project examples that show how multiple ES6 features work together in practical application development scenarios.
No coverage of tooling and ecosystem
The book focuses purely on the language specification and does not discuss the tooling ecosystem around ES6, such as Babel transpilation, webpack bundling, or how to set up a modern development environment to use these features.
Text-heavy learning format
As a traditional book format, it lacks interactive exercises, quizzes, or hands-on coding challenges that many modern learning platforms offer, which can make it harder for some learners to retain and apply the concepts.

Understanding ES6 by Nicholas C. Zakas is a highly regarded, thorough resource that clearly explains the features introduced in ECMAScript 2015 and beyond, making it a solid choice for developers wanting to modernize their JavaScript skills.

Written by Nicholas C. Zakas, a respected authority in the JavaScript community
Provides clear, in-depth explanations of ES6 features rather than shallow overviews
Includes practical code examples that illustrate real-world usage
Covers important topics like let/const, arrow functions, classes, modules, promises, and destructuring
Well-organized structure that builds concepts progressively
Available free to read online, lowering the barrier to entry