Book Image

Scala Programming Projects

By : Mikael Valot, Nicolas Jorand
Book Image

Scala Programming Projects

By: Mikael Valot, Nicolas Jorand

Overview of this book

Scala Programming Projects is a comprehensive project-based introduction for those who are new to Scala. Complete with step-by-step instructions and easy-to-follow tutorials that demonstrate best practices when building applications, this Scala book will have you building real-world projects in no time. Starting with the fundamentals of software development, you’ll begin with simple projects, such as developing a financial independence calculator, and then advance to more complex projects, such as a building a shopping application and a Bitcoin transaction analyzer. You’ll explore a variety of Scala features, including its OOP and FP capabilities, and learn how to write concise, reactive, and concurrent applications in a type-safe manner. You’ll also understand how to use libraries such as Akka and Play. Furthermore, you’ll be able to integrate your Scala apps with Kafka, Spark, and Zeppelin, along with deploying applications on a cloud platform. By the end of the book, you’ll have a firm foundation in Java programming that’ll enable you to solve a variety of real-world problems, and you’ll have built impressive projects to add to your professional portfolio.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Chapter 5. Type Classes

In this chapter, you will learn about concepts that are built on top of Scala. The concepts in this chapter will be abstract, and they will require some concentration to understand; do not feel bad if you do not get it right away. Each individual part is relatively easy to understand, but when you put them all together, things can get complicated.

We will be focusing on type classes, with a definition for each one. They will be followed by an example illustrating how type classes can be useful in typical programs. As these concepts can be difficult, we also suggest some optional exercises that can strengthen your understanding. You do not have to do them to be able to follow the rest of the chapter. The solutions to the exercises are available on GitHub.

The majority of type classes presented here come from a library called Cats, created by Typelevel.

In this chapter, we will cover the following type classes:

  • scala.math.Ordering
  • org.scalactic.Equality
  • cats.Semigroup
  • cats...