Functional-Light JavaScript is a balanced, pragmatic exploration of Functional Programming in JavaScript. Functional Programming (FP) is an incredibly powerful paradigm for structuring code that yields more robust, verifiable, and readable programs. If you've ever tried to learn FP but struggled with terms like "monad", mathematical concepts like category theory, or symbols like (lambda), you're not alone. Functional-Light programming distills the most vital aspects of FP—function purity, value immutability, composition, and more!—down to approachable JavaScript patterns. Rather than the all-or-nothing dogmatism often encountered in FP, this book teaches you how to improve your programs line by line.
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Kyle Simpson is an evangelist of the Open Web, passionate about all things JavaScript. He's an author, trainer, speaker, and OSS contributor.
"By focusing on principles instead of terminology, I now feel much more confident in my understanding of foundations of functional programming. I'm motivated and excited to dive even deeper!" --Hannes Lund, Software Developer
"I can say for sure that the FLJS book is mind-blowing! I almost lost my mind with the concepts it explains! This book gave me the right way of programming by understanding concepts more than focusing on Frameworks!" --Islam Attrash, JS Engineer
"Nobody explains JavaScript as well as Kyle Simpson. He is as thorough as he is humble, explaining complex ideas in simple language. Kyle makes learning JavaScript easy without skipping the details." --Dmitri Wolf, Front End Developer, IBM
"After reading this book, I finally found the reason why I should use functional programming. Although I'm experienced in using list operators, chapter 9 gave me a new point of view to use them better. I would recommend this book to my coworkers." --Tuyen Ho, Full-Stack Developer, Grande JSC
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