Scala Programming Projects

By : Valot, Nicolas Jorand

3.8 (5)

Buy this Book

Scala Programming Projects

3.8 (5)

By: Valot, Nicolas Jorand

Buy this Book

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.

Preface

Who this book is for

What this book covers

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Free Chapter

Writing Your First Program

Setting up your environment

Using the basic features

Running the Scala Console

Using the Scala Console and Worksheet

Creating my first project

Summary

Developing a Retirement Calculator

Project overview

Calculating the future capital

Calculating when you can retire

Using market rates

Packaging the application

Summary

Handling Errors

Setup

Using exceptions

Ensuring referential transparency

Using Option

Using Either

Using ValidatedNel

Summary

Questions

Further reading

Advanced Features

Project setup

Strictness and laziness

Covariance and contravariance

Currying and partially applied functions

Implicits

Summary

Type Classes

Understanding type classes

Common type classes

Summary

Online Shopping - Persistence

Creating the project

Persistence

Deploying the application

Heroku configuration

Summary

Online Shopping - REST API

The REST API

Implementing the API with persistence

Swagger

Deploying on Heroku

Summary

Online Shopping - User Interface

Learning objectives

Setting up

Defining the layout

Creating the layout

Building the page

Main layout

Product list panel

Cart panel

Introducing the UI manager

Summary

Interactive Browser

Actors

Setting up

Implementing the server side

Implementing the client side

Summary

Fetching and Persisting Bitcoin Market Data

Setting up the project

Understanding Apache Spark

Implementing the transaction batch producer

Summary

Batch and Streaming Analytics

Introduction to Zeppelin

Analyzing transactions with Zeppelin

Introducing Apache Kafka

Streaming transactions to Kafka

Introducing Spark Streaming

Analyzing streaming transactions with Zeppelin

Summary

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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...