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)

Working with actor systems

The strength of the actor model is that actors are lightweight, which means you can use millions of them on a single JVM running on an ordinary computer. Most of the time, you are not going to use a single actor but many actors. This requires a model to handle multiple actors.

In Akka, actors are organized in hierarchical trees—meaning that every actor has a parent and can have multiple children. Next, we will have a look at a slightly more complicated example that will showcase how actors work in hierarchies.

Task specification

Imagine we need to have multiple actors that all output a greeting to a given name to the log. Imagine also that we need to abstract away the fact that there are multiple...