Book Image

Mastering JavaScript Functional Programming - Second Edition

By : Federico Kereki
Book Image

Mastering JavaScript Functional Programming - Second Edition

By: Federico Kereki

Overview of this book

Functional programming is a paradigm for developing software with better performance. It helps you write concise and testable code. To help you take your programming skills to the next level, this comprehensive book will assist you in harnessing the capabilities of functional programming with JavaScript and writing highly maintainable and testable web and server apps using functional JavaScript. This second edition is updated and improved to cover features such as transducers, lenses, prisms and various other concepts to help you write efficient programs. By focusing on functional programming, you’ll not only start to write but also to test pure functions, and reduce side effects. The book also specifically allows you to discover techniques for simplifying code and applying recursion for loopless coding. Gradually, you’ll understand how to achieve immutability, implement design patterns, and work with data types for your application, before going on to learn functional reactive programming to handle complex events in your app. Finally, the book will take you through the design patterns that are relevant to functional programming. By the end of this book, you’ll have developed your JavaScript skills and have gained knowledge of the essential functional programming techniques to program effectively.
Table of Contents (17 chapters)
Technical Requirements

Implementing Design Patterns - The Functional Way

In Chapter 10, Ensuring Purity – Immutability, we saw several functional techniques to solve different problems. However, programmers who are used to employing OOP may find that we have missed some well-known formula and solutions that are often used in imperative coding. Since design patterns are well known, and programmers will likely already be aware of how they are applied in other languages, it's important to take a look at how a functional implementation would be done.

In this chapter, we shall consider the solutions implied by design patterns, which are common in OOP, to see their equivalences in FP. This will help you to transition from OOP to a more functional approach and to learn more about the power and methods of FP, by seeing an alternative solution to problems you already knew.

In particular, we...