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

Common type classes


In a typical project, you will not create many of your own type classes. Since type classes capture behaviors that are common across several types, it is likely that someone else has already implemented a type class similar to what you need, located in a library. It is usually more productive to reuse type classes defined in the SDK (or in third-party libraries) than to try and define your own.

In general, these libraries define predefined instances of a type class for the SDK types (String, Int, Option, and so on). You would typically reuse these instances to derive instances for your own types.

In this section, we will present the type classes that you are most likely to encounter, and how to use them to solve day-to-day programming challenges.

scala.math.Ordering

Ordering is an SDK type class that represents a strategy to sort the instances of a type. The most common use case is to sort the elements of a collection, as follows:

Vector(1,3,2).sorted
// res0: scala.collection...