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)

Rich Wrapper pattern

In this section, we will start our journey to understand the pattern of type classes. We'll start by covering the idea of the Rich Wrapper pattern. The pattern is specific to Scala, but it introduces the problem of separating data from behavior, which becomes important in the Type Class pattern.

Motivation

Consider the following problem. Scala is a language built on top of JVM, so it has access to the Core Java library, and you can use the Java Core classes. You can also use any Java library in your Scala programs.

In this manner, Scala String and Array data types come from the Java Core. However, if you are familiar with Scala, you know that String and Array are more like Scala collections than Java...