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

Object-oriented design patterns

In this section, we'll go over some of the GoF design patterns, check whether they are pertinent to FP, and study how to implement them. Of course, some design patterns don't get an FP solution. As we said, for example, there's no equivalent for a Singleton, which implies the foreign concept of a globally accessed object. Additionally, while it's true that you may no longer need OOP-specific patterns, developers will still think in terms of those. Also, finally, since we're not going fully functional if an OOP pattern fits, why not use it?

We will be considering the following:

  • Façade and Adapter, to provide new interfaces to other code
  • Decorator (also known as Wrapper) to add new functionality to existing code
  • Strategy, Template, and Command, to let you fine-tune algorithms by passing functions as parameters
  • Observer...