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


In this chapter, we have started working with higher-order functions, so as to show a more declarative way of working, with shorter, more expressive code. We have gone over several operations: we have seen .reduce() and .reduceRight(), to get a single result from an array; .map(), to apply a function to each element of an array; .forEach(), to simplify looping; .filter(), to pick elements from an array; .find() and .findIndex(), to search in an array, and .every() and .some(), to verify general logic conditions.

In Chapter 6, Producing Functions - Higher-Order Functions, we will continue working with higher order functions, but we will then turn to writing our own ones, to gain more expressive power for our coding.