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

Understanding different ways of metaprogramming methods

There are two separate approaches to metaprogramming in Ruby. The two separate approaches each have advantages and disadvantages, so the most appropriate one to use depends on the specific situation.

So far in this chapter, you've seen examples of using define_method, which is one of the methods used in block-based metaprogramming. There are other block-based metaprogramming methods, such as,, and Kernel#define_singleton_method: do
  # class-level block metaprogramming
end do
  # module-level block metaprogramming
define_singleton_method(:method) do
  # singleton-method defining block metaprogramming

Using these block-based metaprogramming methods is the recommended approach in most cases. The main flexibility advantage of using the block-based metaprogramming approach is that you can easily operate with external data and even external...