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A dynamic, expressive language designed for developer happiness. Known for the Ruby on Rails web framework.
Yukihiro "Matz" Matsumoto designed Ruby in the mid-1990s in Japan with the explicit goal of making programming enjoyable, prioritizing developer happiness over machine efficiency. Everything in Ruby is an object — including numbers, booleans, and nil — and the language provides powerful metaprogramming capabilities through open classes, method_missing, and define_method that allow programs to modify themselves at runtime. Ruby gained worldwide prominence through Ruby on Rails, the web framework created by David Heinemeier Hansson in 2004 that popularized conventions like MVC architecture, convention over configuration, and database migrations.
Companies including GitHub, Shopify, Airbnb, and Basecamp built their platforms on Rails. Beyond web development, Ruby powers automation tools like Chef and Vagrant, testing frameworks like RSpec and Cucumber, and DevOps workflows through tools like Fastlane for mobile deployment. The language supports multiple paradigms — object-oriented, functional, and procedural — with features like blocks, procs, lambdas, and an Enumerable module that provides rich collection processing.
RubyGems, the package manager, hosts over 175,000 gems. Modern Ruby (3.x) has focused on performance with YJIT (a just-in-time compiler), concurrency with Ractors and Fiber Scheduler, and type checking through RBS type signatures and tools like Steep and Sorbet. While Ruby's market share has narrowed from its 2010s peak, it maintains a dedicated community and remains the pragmatic choice for rapid application development.
Ruby's metaprogramming and DSL-heavy conventions mean that changes to method definitions, mixins, and callbacks can have non-obvious cascading effects. Comparing files catches altered ActiveRecord callbacks that change data lifecycle behavior, modified concern inclusions that affect multiple models, changed route definitions that break API endpoints, and updated Gemfile dependencies that may introduce version conflicts.
Diff review is especially important in Rails apps where convention-driven code makes implicit behavior changes hard to spot without side-by-side comparison.
UtraDiff diffs Ruby files using Ruby syntax highlighting, covering blocks, symbols, method definitions, and string interpolation. Side-by-side view aligns class and module definitions across panels. Inline view compresses DSL-heavy code like RSpec specs to highlight logic changes.
The whitespace toggle handles different indentation preferences across team members. Alt+Arrow navigation jumps between changed methods, and tokenization distinguishes symbol changes from string modifications.
Supported extensions: .rb