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

Object-oriented design patterns

In this section, we'll go over some of the GoF design patterns, check whether they are pertinent to FP, and study how to implement them. Of course, there are some design patterns that don't get an FP solution. For example, there's no equivalent for a Singleton, which implies the foreign concept of a globally accessed object. Also, while it's true that you may no longer need OOP-specific patterns, developers will still think in terms of those. Also, finally, since we're not going fully functional if an OOP pattern fits, why not use it?

Façade and Adapter

Out of these two patterns, let's start with the Façade. This is meant tosolve the problem of providing a different interface to the methods of a class or to a library. The idea is to provide a new interface to a system that makes it easier to use. You might say that aFaçade provides a better control panelto access certain functionalities, removing difficulties for the user.


Façade or facade? The original word...