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

Creating persistent data structures

If you want to change something in a data structure and you just go and change it, your code will be full of side effects. On the other hand, copying complete structures every time is a waste of time and space. There's a middle ground to this that has to do with persistent data structures, which, if handled correctly, let you apply changes while creating new structures in an efficient way.

Given that there are many possible data structures you could work with, let's just take a look at a few examples:

  • Working with lists, one of the simplest data structures
  • Working with objects, a very common necessity in JavaScript programs
  • Dealing with arrays, which will prove to be harder to work with

Let's get started!

Working with lists