Book Image

Mastering Functional Programming

Book Image

Mastering Functional Programming

Overview of this book

Functional programming is a paradigm specifically designed to deal with the complexity of software development in large projects. It helps developers to keep track of the interdependencies in the code base and changes in its state in runtime. Mastering Functional Programming provides detailed coverage of how to apply the right abstractions to reduce code complexity, so that it is easy to read and understand. Complete with explanations of essential concepts, practical examples, and self-assessment questions, the book begins by covering the basics such as what lambdas are and how to write declarative code with the help of functions. It then moves on to concepts such as pure functions and type classes, the problems they aim to solve, and how to use them in real-world scenarios. You’ll also explore some of the more advanced patterns in the world of functional programming such as monad transformers and Tagless Final. In the concluding chapters, you’ll be introduced to the actor model, which you can implement in modern functional languages, and delve into parallel programming. By the end of the book, you will be able to apply the concepts of functional programming and object-oriented programming (OOP)in order to build robust applications.
Table of Contents (17 chapters)

A motivation for organizing type classes into systems and libraries

The basic principle of engineering is abstracting away what repeats. In the previous chapters, we saw how functional programming deals with effect types extensively and encapsulates side effects into them. This is because working with them directly can be tedious. It is pretty hard to analyze these data structures in an ad hoc using only the services provided to you by your programming language of choice. Hence, patterns of working with effect types get abstracted away into type classes.

So far, we have only seen a small amount of type classes. However, the most important thing to realize is the principle behind their creation, that is, realizing how the type classes get created and what the motivation is for their existence. The motivation for creating new type classes is precisely dealing with the complexity...