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

Using functions in FP ways

There are several common coding patterns that actually take advantage of FP style, even if you weren't aware of it. In this section, we will go through them and look at the functional aspects of the code so that you can get more accustomed to this coding style.

Then, we'll look in detail at using functions in an FP way by considering several FP techniques, such as the following:

  • Injection, which is needed for sorting different strategies, as well as other uses
  • Callbacks and promises, introducing the continuation-passing style
  • Polyfilling and stubbing
  • Immediate invocation schemes

Injection – sorting it out

The first example of passing functions...