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 interpreter design pattern


In modern programming, we sometimes have to deal with problems from well-understood and well-defined domains. In some cases, it makes sense to represent the domain with a language, which could then make it easy to solve problems using an interpreter. This is exactly what the interpreter design pattern is useful for:

Note

It specifies how to evaluate sentences in a language by representing it using classes and building syntax trees to evaluate the language expressions.

The interpreter design pattern makes use of the composite design pattern as well. Some common uses of interpreters are for language parsing, protocols, and so on.

Class diagram

Creating a language and grammar is a complicated task and before getting into it, developers should be confident that it is actually worth the effort. It requires a really good understanding of the domain that is being modeled and usually takes some time. In this section, we will present the class diagram concerning the interpreter...