Book Image

Polished Ruby Programming

By : Jeremy Evans
5 (1)
Book Image

Polished Ruby Programming

5 (1)
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

Using Ruby's extensibility features

One of the great aspects of Ruby is that even if you don't explicitly design your library for extensibility, the language itself offers ways to make the library extensible. Using the built-in language features directly makes it possible to extend a library, even if the library itself wasn't designed for extensibility.

Ruby has many ways to modify the behavior of objects. Other than the immediate objects, which we discussed in Chapter 1, Getting the Most out of Core Classes, and objects that are frozen and cannot be modified, all Ruby objects support extension by modifying the object's singleton class.

Commonly, libraries will define methods in classes. Let's say you are designing a Ruby library to manage books and users for physical libraries (those that lend out books such as this book). The physical library has many users, most of whom check out books on a regular basis. For each user, you want to track the books...