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

Functional design patterns

After having seen several OOP design patterns, it may seem a cheat to say that there's no approved, official, or even remotely generally accepted similar list of patterns for FP. There are, however,several problems for which there are standard FP solutions, which can be considered design patterns on their own, and we have already covered most of them in the book.

What are candidates for a possible list of patterns? Let's attempt preparing one -- but remember, it's just a personal view; also, I'll admit that I'm not trying to mimic the usual style ofpattern definition--I'll just be mentioning a general problem and refer to the way FP in JS can solve it, and I won't be aiming for nice, short, memorable names for the patterns either:

  • Processing collections using filter/map/reduce:Whenever you have to process a data collection, using declarative, higher-order functions, as filter(), map(), and reduce(), as we saw in Chapter 5,Programming Declaratively - A Better Style...