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

Wrapping functions – keeping behavior

In this section, we'll consider some higher-order functions that provide a wrapper around other functions to enhance them in some way but without altering their original objective. In terms of design patterns (which we'll be revisiting in Chapter 11, Implementing Design Patterns  The Functional Way), we can also speak of decorators. This pattern is based on the concept of adding some behavior to an object (in our case, a function) without affecting other objects. The term decorator is also popular because of its usage in frameworks such as Angular or (in an experimental mode) for general programming in JavaScript.

Decorators are being considered for general adoption in JavaScript, but are currently (December 2019) still at Stage 2, Draft level, and it may be a while until they get to Stage 3 (Candidate) and finally...