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

Using method_missing judiciously

In general, you should only use method_missing in cases where it is required. Overuse of method_missing in cases where it isn't necessary often leads to code that is difficult to understand and refactor. If you have a use case where literally any method can be called and should work, that is a good case for method_missing.

Let's say you want a method where you can just type random words in, and it will return a list of symbols:

words{this is a list of words}
# => [:this, :is, :a, :list, :of, :words]

This is a case where method_missing makes sense because any method could be called. Implementing this particular example is interesting. You want words to be a valid method you can call anywhere, but you want words inside the block to call method_missing. You can implement this by having instance_eval the block in the context of a BasicObject instance. It would be great to use define_singleton_method or singleton_class.define_method...