Book Image

Polished Ruby Programming

By : Jeremy Evans
Book Image

Polished Ruby Programming

By: Jeremy Evans

Overview of this book

Anyone striving to become an expert Ruby programmer needs to be able to write maintainable applications. Polished Ruby Programming will help you get better at designing scalable and robust Ruby programs, so that no matter how big the codebase grows, maintaining it will be a breeze. This book takes you on a journey through implementation approaches for many common programming situations, the trade-offs inherent in each approach, and why you may choose to use different approaches in different situations. You'll start by refreshing Ruby fundamentals, such as correctly using core classes, class and method design, variable usage, error handling, and code formatting. Then you'll move on to higher-level programming principles, such as library design, use of metaprogramming and domain-specific languages, and refactoring. Finally, you'll learn principles specific to web application development, such as how to choose a database and web framework, and how to use advanced security features. By the end of this Ruby programming book, you’ll be a well rounded web developer with a deep understanding of Ruby. While most code examples and principles discussed in the book apply to all Ruby versions, some examples and principles are specific to Ruby 3.0, the latest release at the time of publication.
Table of Contents (23 chapters)
Section 1: Fundamental Ruby Programming Principles
Section 2: Ruby Library Programming Principles
Section 3: Ruby Web Programming Principles

Chapter 13: Using Common Design Patterns

In the last chapter, you learned how best to handle change in your libraries. A couple of common changes are to implement new design patterns or to remove inappropriate design patterns. While design patterns are not as necessary in Ruby as they are in less powerful languages, they are still a useful tool to have in your toolbox. When dealing with design patterns, it is important to understand when it is useful to apply them, and when it is best to abstain from doing so. So in this chapter, you'll also learn when it is appropriate to use specific design patterns.

In this chapter, we will cover the following topics:

  • Learning about the many design patterns that are built into Ruby
  • Handling cases where there can be only one
  • Dealing with nothing
  • Visiting objects
  • Adapting and strategizing

By the end of this chapter, you'll better understand design patterns that are built into Ruby, and how and why to implement...