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

Summary


In this chapter, we saw how we can handle optional values and how to handle errors in a purely functional way. You are now better equipped to write safer programs that do not throw exceptions and crash unexpectedly.

If you use Java libraries or some non-purely-functional Scala libraries, you will notice that they can throw exceptions. If you do not want your program to crash when exceptions are raised, I advise you to wrap them as early as possible insideEither or Validated.

We saw how Either can be used to handle errors sequentially, and how Validated can handle errors in parallel. As these two types are very similar, I would advise you to use Validated most of the time. Instances of Validated can indeed handle errors in parallel using mapN, but they can also perform sequential validation using andThen

This chapter went a bit further in the way of writing programs in a functional way. In the next chapter we will explore other features of the language that you will necessarily encounter...