Book Image

Scala Design Patterns

By : Ivan Nikolov
Book Image

Scala Design Patterns

By: Ivan Nikolov

Overview of this book

Scala has become increasingly popular in many different IT sectors. The language is exceptionally feature-rich which helps developers write less code and get faster results. Design patterns make developer’s lives easier by helping them write great software that is easy to maintain, runs efficiently and is valuable to the company or people concerned. You will learn about the various features of Scala and be able to apply well-known, industry-proven design patterns in your work. The book starts off by focusing on some of the most interesting features of Scala while using practical real-world examples. We will also cover the popular "Gang of Four" design patterns and show you how to incorporate functional patterns effectively. By the end of this book, you will have enough knowledge and understanding to quickly assess problems and come up with elegant solutions.
Table of Contents (20 chapters)
Scala Design Patterns
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Index

Self types


One of the features of good code is the separation of concerns. Developers should aim to make classes and their methods responsible for one and only one thing. This helps in testing, maintaining, and simply understanding code better. Remember: simple is always better.

However, it is inevitable that when writing real software, we will need instances of some classes within other ones in order to achieve certain functionalities. In other words, once our building blocks are nicely separated, they would have dependencies in order to perform their functionality. What we are talking about here really boils down to dependency injection. Self types provide a way to handle these dependencies in an elegant way. In this section, we will see how to use them and what they are good for.

Using self types

Self types allow us to easily separate code in our applications, and then require it from other places. Everything gets clearer with an example, so let's have a look at one. Let's assume that we...