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

Profiling first, optimizing second

It's better to never guess where the slow parts of your library are, since you will often be incorrect. There is one way to know where the slow parts of your library are, and that is to profile your library. There are a couple of good options for profiling libraries in Ruby, ruby-prof and stackprof. There are other profilers for Ruby, such as rack-mini-profiler and rbspy, but they mostly focus on profiling production applications and not libraries, so we won't discuss them further. However, you may want to remember them if you need to profile a production application.

ruby-prof is one of the oldest profiling libraries for Ruby, and still one of the best. It is a tracing profiler, meaning that it keeps track of every single method call Ruby is making, so it generally results in the most accurate profiling. However, because of this, it's the slowest profiler, about two to three times slower than running standard Ruby. This means it...