ruby

Idiomatic Ruby uses blocks and procs to encapsulate reusable logic passed to iterators. You define procs with Proc.new and yield to blocks within methods, creating concise, maintainable code patterns.

Error handling in Ruby is best managed by raising custom exceptions and implementing retry mechanisms. This approach ensures robust failure recovery and maintains application stability during unexpected runtime conditions.

Metaprogramming in Ruby works by dynamically defining methods and utilizing method_missing to intercept undefined calls. These techniques allow developers to build flexible internal domain-specific languages efficiently.

Ractors and threads enable concurrency in Ruby by executing code simultaneously. Fibers provide lightweight cooperative concurrency, while Ractors offer parallel execution without thread-safety concerns.

RSpec testing examples are included to demonstrate best practices for validating code. These examples show how to structure tests effectively alongside idiomatic patterns, metaprogramming, and concurrency implementations.

Use classes to instantiate objects and hold state, while modules group shared methods for mixin inclusion. This distinction prevents duplication and keeps your application architecture clean and maintainable.