Jack Widman - Learning Functional Programming: Managing Code Complexity by Thinking Functionally
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Learn how to think and write code like a functional programmer. With this practical guide, software developers familiar with object-oriented programming will dive into the core concepts of functional programming and learn how to use both functional and OOP features together on large or complex software projects.
Author Jack Widman uses samples from Java, Python, C#, Scala, and JavaScript to help you gain a new perspective and a set of tools for managing the complexity in your problem domain. Youll be able to write code thats simpler, reusable, easier to test and modify, and more consistently correct. This book also shows you how to use patterns from category theory to help bridge the gap between OOP and functional programming.
- Learn functional programming fundamentals and explore the way functional programmers approach problems
- Understand how FP differs from object-oriented and imperative programming
- Use a set of practical, applicable design patterns that model reality in a functional way
- Learn how to incorporate FP and OOP features into software projects
- Apply functional design patterns appropriately and use them to write correct, robust, and easily modifiable code
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by Jack Widman , PhD
Copyright 2022 Jack Widman. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
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- August 2022: First Edition
- 2022-08-11: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781098111755 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. Learning Functional Programming, the cover image, and related trade dress are trademarks of OReilly Media, Inc.
The views expressed in this work are those of the author, and do not represent the publishers views. While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-098-11175-5
[LSI]
To my three wonderful daughters: Katherine, Annie, and Victoria. And to Andrea, whose support and love have encouraged me in so many ways.
Over the past few years, functional programming (FP) has been experiencing a renaissance. Many companies are looking for programmers with experience in FP, as languages that were not originally designed to be functional have evolved over time to include functional capabilities: languages such as Java, JavaScript, and Python, to name a few. The push for programmers with functional experience is due, in part, to a perceived improvement in the development process, including a sense that fewer bugs are produced and more extensible and robust code is produced when following the functional way. Whether this is true or notand whether a greater percentage of the code written in the coming years is functionalwill become evident in time. For now, let us consider FP one of a number of paradigms, each with its own pros and cons.
Essentially, all programmers. If you have no experience in FP, but have heard about it and you are curious, or even if you picked up this book in a store without any knowledge of FP, this book will prove useful to you. Experienced FP programmers too, will find something to benefit them. The book dives into the category theory roots of FP in a way not presented in other books on this subject. Finally, programmers with some experience using FP but who want to gain a more advanced understanding of the concepts and theory that make up FP will find much to use and enjoy.
I endeavor to demonstrate, through various programming languages, how functional constructs can improve our code. However, you will notice that Scala is the frequent language of choice for code examples due to the ease with which functional ideas can be expressed in Scala; the reader will more easily appreciate and understand the functional ideas when they are expressed in the natural way, which Scala allows. For a mini-introduction to Scala, see the .
The following typographical conventions are used in this book:
ItalicIndicates new terms, URLs, email addresses, filenames, and file extensions.
Constant widthUsed for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.
This element signifies a tip or suggestion.
This element signifies a general note.
This element indicates a warning or caution.
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Functional programming? Functors? Monoids? Monads? Im not a mathematician! you might say. How can I learn these esoteric concepts? And why would I want to? These concerns are totally understandable. But the truth is you dont need to be a mathematician to be a functional programmer.
The fundamental concepts of FP are easy to understand when presented in a clear, straightforward way. And that is what this book is about. Making FP understandable and practical. In particular, I will teach you how to think like a functional programmer. But why would you want to learn FP?
Picture this. Its 10 p.m. and you are totally stuck while trying to fix a bug in a program you need to submit in the morning. The problem seems to be centered around a variable called ratio. The problem is that depending on the state of the system you are modeling, the variable ratio keeps changing. Your frustration builds. Or you have a deadline at work and there is an elusive bug in your microservice that you are chasing down. The problem seems to be in two nested for loops in which variables are modified in a fairly complex way. The logic is complex and you dont quite see the solution. If only there were a way to write programs in a way in which the value of variables would not change! FP to the rescue.
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