ClojureScript Koans is a book that takes readers on a journey to learn ClojureScript, a programming language designed to be used with JavaScript. The book is written in the form of koans, which are small coding exercises designed to challenge readers and help them improve their coding skills.

The book begins with an introduction to ClojureScript, explaining what it is, how it works, and why it is useful. The authors then delve into the koans, which are organized into various categories, such as functions, collections, and macros. Each koan is presented with a brief description of what it is trying to teach, followed by a code snippet that needs to be completed by the reader.

As readers progress through the book, they will encounter increasingly difficult koans that will test their understanding of ClojureScript. However, the authors have done an excellent job of providing hints and explanations, so readers won’t get stuck for too long. The book is also accompanied by an online repository that contains solutions to each koan, so readers can check their work and compare their solutions with others.

One of the great things about ClojureScript Koans is that it is written in a very approachable and engaging style. The authors clearly love ClojureScript and want to share their enthusiasm with readers. They use humor, anecdotes, and interesting examples to make the learning process enjoyable and memorable.

In addition to being a great resource for learning ClojureScript, ClojureScript Koans also serves as an excellent introduction to functional programming. ClojureScript is a functional language, which means that it emphasizes functions and immutable data structures. The authors do an excellent job of explaining these concepts and showing how they can be used to write clean, concise, and elegant code.

Overall, ClojureScript Koans is an excellent book for anyone who wants to learn ClojureScript or functional programming in general. The book is well-written, engaging, and provides plenty of challenges to keep readers motivated. If you are looking for a fun and effective way to learn ClojureScript, this book is definitely worth checking out.