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Home> Programming> Functional Programming> Mastering JavaScript Functional Programming
Mastering JavaScript Functional Programming
Mastering JavaScript Functional Programming

Mastering JavaScript Functional Programming: In-depth guide for writing robust and maintainable JavaScript code in ES8 and beyond

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Profile Icon Federico Kereki
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€36.99
Full star iconFull star iconFull star iconFull star iconHalf star icon4.6(7 Ratings)
PaperbackNov 2017386 pages1st Edition
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Mastering JavaScript Functional Programming

Thinking Functionally - A First Example

Inchapter 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 justshow how FP can give a different outlook for our problem, and leave further details...

A functional solution

Let's try to be more general: after all, requiring that some function or other be executed only once, isn't that outlandish, and may be required elsewhere! Let's lay down some principles:

  • The original function (the one that may be called only once) should do that thing, and no other
  • We don't want to modify the original function in any way
  • We need to have a new function that will call the original one only once
  • We want a general solution that we can apply to any number of original functions
...

Questions

2.1.No extra variables: Our functional implementation required using an extra variable,done, to mark whether the function had already been called. Not that it matters... but could you make do without using any extra variables? Note that we aren't telling younot to use any variables; it's just a matter of not adding any new ones, such asdone, and only as an exercise!

2.2.Alternating functions: In the spirit of ouronceAndAfter() function, could you write analternator() higher-order function that gets two functions as arguments, and on each call, alternatively calls one and another? The expected behavior should be as in the following example:

     let sayA = () => console.log("A");
let sayB = () => console.log("B");

let alt =alternator(sayA, sayB);
alt(); //A
alt(); //B
alt(); //A
alt(); //B
alt...
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Key benefits

  • Become proficient and skilled with Functional Programming in JavaScript to solve real-world development problems
  • Successfully apply Functional Programming concepts and techniques to everyday JavaScript programming
  • Bring modularity, reusability, testability, and performance to your web apps

Description

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.

Who is this book for?

If you are a JavaScript developer and want to apply functional programming techniques, then this book is for you. Only a basic knowledge of the concepts of functional programming is required for this book.

What you will learn

  • Create more reliable code with closures and immutable data
  • Convert existing methods into pure functions, and loops into recursive methods
  • Develop more powerful applications with currying and function composition
  • Separate the logic of your system from implementation details
  • Implement composition and chaining techniques to simplify coding
  • Use functional programming techniques where it makes the most sense
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Publication date :Nov 29, 2017
Length:386 pages
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Language :English
ISBN-13 :9781787287440
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Frequently bought together


Mastering JavaScript Functional Programming
Mastering JavaScript Functional Programming
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Table of Contents

14 Chapters
Becoming Functional - Several QuestionsChevron down iconChevron up icon
Becoming Functional - Several Questions
What is Functional Programming?
Why use Functional Programming?
Is JavaScript functional?
How do we work with JavaScript?
Questions
Summary
Thinking Functionally - A First ExampleChevron down iconChevron up icon
Thinking Functionally - A First Example
The problem - do something only once
Some bad solutions
A functional solution
Questions
Summary
Starting Out with Functions - A Core ConceptChevron down iconChevron up icon
Starting Out with Functions - A Core Concept
All about functions
Using functions in FP ways
Questions
Summary
Behaving Properly - Pure FunctionsChevron down iconChevron up icon
Behaving Properly - Pure Functions
Pure functions
Impure functions
Testing - pure versus impure
Questions
Summary
Programming Declaratively - A Better StyleChevron down iconChevron up icon
Programming Declaratively - A Better Style
Transformations
Logical higher-order functions
Questions
Summary
Producing Functions - Higher-Order FunctionsChevron down iconChevron up icon
Producing Functions - Higher-Order Functions
Wrapping functions
Altering functions
Other higher-order functions
Questions
Summary
Transforming Functions - Currying and Partial ApplicationChevron down iconChevron up icon
Transforming Functions - Currying and Partial Application
A bit of theory
Currying
Partial application
Partial currying
Final thoughts
Questions
Summary
Connecting Functions - Pipelining and CompositionChevron down iconChevron up icon
Connecting Functions - Pipelining and Composition
Pipelining
Composing
Questions
Summary
Designing Functions - RecursionChevron down iconChevron up icon
Designing Functions - Recursion
Using recursion
Recursion techniques
Questions
Summary
Ensuring Purity - ImmutabilityChevron down iconChevron up icon
Ensuring Purity - Immutability
The straightforward JS way
Persistent data structures
Questions
Summary
Implementing Design Patterns - The Functional WayChevron down iconChevron up icon
Implementing Design Patterns - The Functional Way
What are Design Patterns?
Object-oriented design patterns
Functional design patterns
Questions
Summary
Building Better Containers - Functional Data TypesChevron down iconChevron up icon
Building Better Containers - Functional Data Types
Data types
Containers
Functions as data structures
Questions
Summary
BibliographyChevron down iconChevron up icon
Bibliography
Answers to QuestionsChevron down iconChevron up icon
Answers to Questions

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Customer reviews

Top Reviews
Rating distribution
Full star iconFull star iconFull star iconFull star iconHalf star icon4.6
(7 Ratings)
5 star71.4%
4 star14.3%
3 star14.3%
2 star0%
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JacobJul 07, 2019
Full star iconFull star iconFull star iconFull star iconFull star icon5
I'm a professional developer with more than 15 years of experience. So I'm not really a kid excited by a "cool" line of code or a new technology that will get old in the next few years or so.This book is about a particular approach to programming which is why I like it.
Amazon Verified reviewAmazon
Cheung Wai LokOct 10, 2018
Full star iconFull star iconFull star iconFull star iconFull star icon5
i would recommend it to those who want to learn FP in javascript
Amazon Verified reviewAmazon
Amazon CustomerJun 13, 2018
Full star iconFull star iconFull star iconFull star iconFull star icon5
Great book
Amazon Verified reviewAmazon
ReneMar 11, 2018
Full star iconFull star iconFull star iconFull star iconFull star icon5
Ich bin absolut begeistert von dem Buch, viele gute Beispiele die immer wieder aufgegriffen werden und durchweg klasse erklärt. Die Taschenbuchfassung ist jedoch das letzte was mir je untergekommen ist. Haufenweise lose Seiten die herausfallen, teilweise üble Druckfehler. Hoffe aber das war eine schlimme Ausnahme.
Amazon Verified reviewAmazon
Adrian PerezFeb 07, 2018
Full star iconFull star iconFull star iconFull star iconFull star icon5
I enjoyed the practical approach, and the decision as to not use libraries which are common source of confusion and rather fragmented in the JS ecosystem (e.g you use ramda but you need sanctuary or folktale, etc). As someone who has been learning Clojure and Haskell over the past year and wishing I could just straight up use those at work, this book provided a sign of relief in showing how to get some of their features in Javascript. It goes a long way into functional thinking and its explanation of recursion it’s one of the most enjoyable I’ve seen.
Amazon Verified reviewAmazon
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About the author

Profile icon Federico Kereki
Federico Kereki
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Federico Kereki is a Uruguayan Systems Engineer, with a Master's degree in Education, and over 30 years of experience as a consultant, system developer, and writer. Currently a Subject Matter Expert at Globant, he has taught at Universidad de la República, Universidad ORT Uruguay, and Universidad de la Empresa. He has written articles and booklets on programming, web development, security, and open source topics for blogs, magazines, and websites. He has also written several books, including Modern JavaScript Web Development Cookbook and the upcoming Data Structures and Algorithms in JavaScript. He resides, works, and teaches in Uruguay, but he wrote the first edition of this book while working in India, and the second edition during a sojourn in Mexico.
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