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

Chapter 2. Thinking Functionally - A First Example

In chapter 1, Becoming Functional - Several Questions, we went over what FP is, mentioned some advantages of applying it, and listed some tools we'd be needing in JS... but let's now leave theory behind, and start out by considering a simple problem, and how to solve it in a functional way.

In this chapter, we will see:

  • A simple, common, e-commerce related problem
  • Several usual ways to solve it, with their associated defects
  • A way to solve the problem by looking at it functionally
  • A higher-order solution, which can be applied to other problems
  • How to do unit testing for the functional solutions

In future chapters, We'll be coming back to some of the topics listed here, so we won't be getting very much into details. We'll just show how FP can give a different outlook for our problem, and leave further details for afterward.