Codewars VS Understanding ES6

• Wide Range of Challenges
  Codewars offers a broad spectrum of coding challenges ranging from easy to very difficult, catering to all skill levels.
• User Engagement
  The platform encourages community interaction through comments, user-submitted challenges, and solutions, fostering a collaborative learning environment.
• Multiple Languages
  Codewars supports a variety of programming languages, allowing users to practice and improve skills in their language of choice.
• Gamification
  The use of a ranking system, badges, and honor points adds a gamified layer to the learning process, making it more engaging and motivating.
• Detailed Solutions
  After solving a challenge, users can view multiple solutions from others, offering a range of approaches and insights into problem-solving.

Possible disadvantages

• Steep Learning Curve
  Beginners might find some challenges too difficult at first, which can be discouraging without proper guidance or learning resources.
• Quality Variability
  The quality of user-submitted challenges can be inconsistent, meaning not all katas are equally useful or well-designed.
• Limited In-Depth Learning
  While great for practice, Codewars does not provide comprehensive tutorials or in-depth explanations, which are often needed for mastering complex concepts.
• Time Consumption
  The addictive nature of the platform can lead to spending excessive time on solving challenges, potentially detracting from other learning activities.

• 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.

Possible disadvantages

• 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.

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• Of recursion and backtracking

  Recently, I was working on a coding kata on codewars.com. Early on, I started thinking that a potential solution might utilize recursion, a concept that involves a function calling itself. However, I quickly realized that my grasp of... - Source: dev.to / almost 3 years ago

• 4th year, about to fail an entire semester's worth of classes.

  Get more involved. Look into internships and junior SWE positions to get a sample of what you'd be applying for once you graduate. Solve coding challenges, start working on a portfolio of your personal works. I recommend codewars.com for... Source: almost 3 years ago

• Beginner with C++ looking for direction

  I'd recommend to play around with some basic coding challenges on leetcode.com or codewars.com. If the course prepared you well you won't find this useful, but playing around with them will make sure that you are comfortable with basics... Source: about 3 years ago

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Tracking Understanding ES6 since Jun 2026.