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Mastering Functional Programming

You're reading from Mastering Functional Programming Functional techniques for sequential and parallel programming with Scala

Product type Paperback

Published in Aug 2018

Publisher Packt

ISBN-13 9781788620796

Length 380 pages

Edition 1st Edition

Languages

Scala

Concepts

Functional Programming

Table of Contents (23) Chapters

Title Page

Copyright and Credits

Dedication

Packt Upsell

Contributors

Preface

1. The Declarative Programming Style FREE CHAPTER

2. Functions and Lambdas

3. Functional Data Structures

4. The Problem of Side Effects

5. Effect Types - Abstracting Away Side Effects

6. Effect Types in Practice

7. The Idea of the Type Classes

8. Basic Type Classes and Their Usage

9. Libraries for Pure Functional Programming

10. Patterns of Advanced Functional Programming

11. Introduction to the Actor Model

12. The Actor Model in Practice

13. Use Case - A Parallel Web Crawler

1. Introduction to Scala

2. Assessments

3. Other Books You May Enjoy

Leave a review - let other readers know what you think

Index

But how do we get rid of the side effects?

If you come from a purely imperative background, you may be quite confused at this point. Purely functional programming says that you need to eliminate all the side effects. But can you imagine a program without logging? And what would be the use of a web API that cannot connect to a network? If we cannot throw an exception, how do we specify the erroneous behavior of the program?

The side effects specified previously are essential to most modern applications, and it is usually not possible to imagine a reasonable program without side effects.

Therefore, it would be wrong to say that purely functional programming eliminates side effects from your program completely. Instead, it would be more precise to say that it eliminates side effects from your business logic. It pushes side effects away from the parts of your application that matter. The way it usually works with the purely functional style is that your business logic, which encompasses 90% of...

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