Book Image

Scala Design Patterns - Second Edition

By : Ivan Nikolov
Book Image

Scala Design Patterns - Second Edition

By: Ivan Nikolov

Overview of this book

Design patterns make developers’ 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’ll learn about the various features of Scala and will 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 and latest features of Scala while using practical real-world examples. We will be learning about IDE’s and Aspect Oriented Programming. We will be looking into different components in Scala. We will also cover the popular "Gang of Four" design patterns and show you how to incorporate functional patterns effectively. The book ends with a practical example that demonstrates how the presented material can be combined in real-life applications. You’ll learn the necessary concepts to build enterprise-grade applications. By the end of this book, you’ll have enough knowledge and understanding to quickly assess problems and come up with elegant solutions.
Table of Contents (14 chapters)

The state design pattern

The state design pattern is really similar to the strategy design pattern that we looked at in the previous chapter.

The purpose of the state design pattern is to allow us to choose a different behavior of an object based on the object's internal state.

Basically, the difference between the state design pattern and the strategy design pattern comes from the following two points:

  • The strategy design pattern is about how an action is performed. It is usually an algorithm that produces the same results as other algorithms.
  • The state design pattern is about what action is performed. Depending on the state, an object could be doing different things.

Implementing the state design pattern also closely resembles the implementation of the strategy design pattern.

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