Book Image

Scala Functional Programming Patterns

By : Atul S. Khot
Book Image

Scala Functional Programming Patterns

By: Atul S. Khot

Overview of this book

Scala is used to construct elegant class hierarchies for maximum code reuse and extensibility and to implement their behavior using higher-order functions. Its functional programming (FP) features are a boon to help you design “easy to reason about” systems to control the growing software complexities. Knowing how and where to apply the many Scala techniques is challenging. Looking at Scala best practices in the context of what you already know helps you grasp these concepts quickly, and helps you see where and why to use them. This book begins with the rationale behind patterns to help you understand where and why each pattern is applied. You will discover what tail recursion brings to your table and will get an understanding of how to create solutions without mutations. We then explain the concept of memorization and infinite sequences for on-demand computation. Further, the book takes you through Scala’s stackable traits and dependency injection, a popular technique to produce loosely-coupled software systems. You will also explore how to currying favors to your code and how to simplify it by de-construction via pattern matching. We also show you how to do pipeline transformations using higher order functions such as the pipes and filters pattern. Then we guide you through the increasing importance of concurrent programming and the pitfalls of traditional code concurrency. Lastly, the book takes a paradigm shift to show you the different techniques that functional programming brings to your plate. This book is an invaluable source to help you understand and perform functional programming and solve common programming problems using Scala’s programming patterns.
Table of Contents (19 chapters)
Scala Functional Programming Patterns
About the Author
About the Reviewers

Chapter 5. Taming Multiple Inheritance with Traits

When it is summer time in India and the heat is just unbearable, our hands instinctively reach out for either the AC remote or the regulator knob. And in a matter of minutes, we get bliss! An AC remote is pretty simple to operate and so is a ceiling fan regulator. A handful of push buttons that are easily understood by anyone. However, a remote is an interface. It is the system's way of allowing the external world to interact with it. A regulator knob is another, and so is a TV remote and the numeric keypad on your phone. As the air conditioner is a complex system, it needs to expose a simple way in which the consumer can use it. A motorbike too is a complex machine. You just need to know how to kick start it into life, change gears, and off you go. The bike also comes equipped with useful stuff, such as a fuel gauge and a speedometer. An AC remote, a bike fuel gauge, and a fan regulator are all interfaces. Think of a system and you will...