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


In this chapter, you learned all about Ruby's different variable types. You learned how to use local variables whenever possible. You also learned how both local variables and instance variables can provide substantial performance benefits with intelligent caching.

Moving on, we covered that constants are just another type of variable and that both constants and class instance variables can replace the use of class variables. Finally, you learned about global variables and how to replace their usage with constants or accessor methods on singletons.

Most importantly, in this chapter, you learned when it is appropriate to use each of Ruby's variable types, and how to properly name them, which are two of the most important factors in writing Ruby programs that are easy to maintain.

In the next chapter, you'll build on this knowledge, and learn about methods and how best to use their many types of arguments.