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

The facade design pattern


Whenever we are building libraries or big systems, we quite often depend on other libraries and functionality. Implementing methods sometimes requires the use of multiple classes at the same time. This requires knowledge. Whenever we build a library for someone, we usually try and make it simpler for the users by assuming they do not have (and do not need) as extensive knowledge as we do. Additionally, developers make sure that components are easy to use throughout their application. This is where the facade design pattern can become useful.

Note

Its purpose is to wrap a complex system with a simpler interface in order to hide the usage complexities and ease the client interaction.

We already looked at other design patterns based on wrapping. While the adapter design pattern transforms one interface to another and the decorator adds extra functionality, the facade makes things simpler.

Class diagram

For the class diagram, let's imagine the following setting: we want...