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)
1
Section 1: Fundamental Ruby Programming Principles
8
Section 2: Ruby Library Programming Principles
17
Section 3: Ruby Web Programming Principles

Using Ruby's favorite variable type – the local variable

Ruby's favorite variable type is the local variable. Local variables are the only variable type that Ruby doesn't require you to use a sigil (for example, @ or $) or use capitalization. This is not by accident, this is by design, to nudge you toward using local variables as much as possible.

In this section, you'll learn how to improve performance by adding local variables, when it's safe to do so, issues involving scope gates, and the importance of local variable naming.

Increasing performance by adding local variables

You may be wondering, Why are local variables better than other types of variables? In Ruby, all other variable types require more indirection. Local variables require the least indirection. When you access a local variable in Ruby, the virtual machine knows the location of the local variable, and can more easily access the memory. Additionally, in most cases, the local...