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

Traits versus classes


Traits could be similar, but also very different to classes. It could be hard for a developer to choose which one to use in various cases but here we will try to provide some general guidelines that should help.

Use classes:

  • When a behavior is not going to be reused at all or in multiple places

  • When you plan to use your Scala code from another language, for example, if you are building a library that could be used in Java

Use traits:

  • When a behavior is going to be reused in multiple unrelated classes.

  • When you want to define interfaces and want to use them outside Scala, for example Java. The reason is that the traits that do not have any implementations are compiled similar to interfaces.