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

Learning when to create a custom class

One of the first questions you need to answer before creating a custom class should probably be, "Do I really need to create a custom class?" Object-oriented design often involves creating classes for each separate type of object. Functional design does away with classes completely, instead having functions that operate on immutable data structures. Procedural design is similar to functional design, but generally involves functions that operate on mutable data structures. No one design approach is best in all cases, and all design approaches have trade-offs. Ruby supports both object-oriented design, functional design, and procedural design, and often maintainable code has a mix of all three.

Choosing to create a custom class is always a trade-off. There is always a cost in creating a custom class versus using a core class, and that is that all classes result in some amount of conceptual overhead. That's true of both core classes...