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

Calculating the future capital


The first thing you need to know when planning for retirement is how much capital you can get at your chosen retirement date. For now, we will assume that you invest your savings every month at a constant rate. To simplify things, we will ignore the effects of inflation, hence the capital calculated will be in today's money and the interest rate will be calculated as real rate = nominal interest rate - inflation rate.

We intentionally do not mention any currency in the rest of this chapter. You can consider that the amounts are in USD, EUR, or any other currency. It will not change the results as long as all the amounts are expressed in the same currency.

Writing a unit test for the accumulation phase

We want a function that behaves similarly to the FV function in Excel: it calculates the future value of an investment based on a constant interest rate. As we follow a TDD approach, the first thing to do is create a failing test:

  1. Create a new Scala project called...