Book Image

Mastering JavaScript Functional Programming

By : Federico Kereki
Book Image

Mastering JavaScript Functional Programming

By: Federico Kereki

Overview of this book

Functional programming is a programming paradigm for developing software using functions. Learning to use functional programming is a good way to write more concise code, with greater concurrency and performance. The JavaScript language is particularly suited to functional programming. This book provides comprehensive coverage of the major topics in functional programming with JavaScript to produce shorter, clearer, and testable programs. You’ll delve into functional programming; including writing and testing pure functions, reducing side-effects, and other features to make your applications functional in nature. Specifically, we’ll explore techniques to simplify coding, apply recursion for loopless coding, learn ways to achieve immutability, implement design patterns, and work with data types. By the end of this book, you’ll have developed the JavaScript skills you need to program functional applications with confidence.
Table of Contents (22 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback
Connecting Functions - Pipelining and Composition
Answers to Questions

Wrapping functions

In this section, let's consider some higher-order functions that provide a wrapper around other function, to enhance it in some way, but without altering its original objective. In terms of design patterns (which we'll be revisiting in Chapter 11, Implementing Design Patterns - The Functional Way), we could 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 JS.


Decorators are being considered for general adoption in JS, but are currently (August 2017) at Stage 2, Draft level, and it may be a while until they get to Stage 3 (Candidate) and finally Stage 4 (Finished, meaning officially adopted). You can read more about decorators for JS at and about the JS adoption process itself...