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

Building containers 

Back in Chapter 5, Programming Declaratively  A Better Style, and later, in Chapter 8, Connecting Functions – Pipelining and Composition, we saw that the ability to be able to apply a mapping to all the elements of an array—and, even better, being able to chain a sequence of similar operations—was a good way to produce better, more understandable code.

However, there is a problem: the map() method (or the equivalent, demethodized one, which we looked at in Chapter 6, Producing Functions  Higher-Order Functions), is only available for arrays, and we might want to be able to apply mappings and chaining to other data types. So, what can we do?

Let's consider different ways of doing this, which will give us several new tools for better functional coding. Basically, there are only two possible ways...