Learn Ruby & Rails: Code & Run

Learn Ruby programming step by step, from your first puts to metaprogramming, and get a solid introduction to Ruby on Rails. 29 courses and 109 short lessons take you from beginner (A1) to advanced (C1), with a code editor that runs your scripts, 60 coding missions, 20 guided projects and an AI mentor for the moments you get stuck. WHY RUBY A clean, readable syntax makes it a gentle first programming language. It is also the language behind Rails, the web framework used for backend development and web apps, and it is handy for everyday scripting and automation. WHAT'S INSIDE • 29 courses and 109 lessons, levels A1 to C1. Your first course is free • Code editor and compiler on your phone: write code, run it and see the real output • 60 coding missions (20 easy, 20 medium, 20 hard), each checked against what your code prints • 20 guided projects built step by step: a todo list, a log parser, a JSON round trip, an Enumerable mixin, pattern matching and more • AI Mentor: ask about an error message, a method or a concept and get a clear explanation • 50 quiz questions with explanations, 50 interview questions and a 73-entry cheat sheet • World Coding Challenge: three global rounds every day. Solve them in Ruby and climb the leaderboard • Certificate exam (Pro) to show what you have learned • Skill tree, streaks, review sessions, reminders, notes and saved code • The app is available in 22 languages THE RUBY CURRICULUM Fundamentals • Introduction to Ruby, strings and text manipulation, numbers and math • Symbols and hashes, conditionals and case statements, control flow • Methods and blocks, working with collections, ranges and Enumerable Object-oriented programming • Classes, objects and core OOP principles • Modules and mixins • Procs, lambdas and closures, iterators and custom enumerables Practical scripting • Regular expressions, dates, times and formatting • Working with files and input/output • JSON, CSV and YAML file formats • Exception handling and debugging, pattern matching • Gems and Bundler, then building and packaging your own gem • Testing and test-driven development (TDD) Web development and backend • Ruby on Rails basics • Rails models and Active Record • Rails controllers and routing • Building small web APIs with Sinatra Advanced topics • Metaprogramming • Concurrency • Performance and profiling HOW IT WORKS 1. Pick a course and learn in short lessons: a little theory, then a code snippet you edit and run 2. Practice right away with quizzes, coding missions and guided projects 3. Stuck on an error? Ask the AI Mentor to explain what went wrong 4. Get ready for a developer job interview with the question bank and the cheat sheet 5. Pass the certificate exam when you finish the tutorial path WHO IT'S FOR • Beginners who want to learn to code with a friendly first language • Developers adding Rails to their backend skills • Students who need extra coding practice between classes • Career switchers learning backend web development • Anyone preparing for a Ruby interview GOOD TO KNOW • The editor runs your scripts on our server, so an internet connection is needed. Rails and Sinatra are taught through lessons and code examples; the editor runs plain Ruby. • Free: the first course, 2 coding missions, the first guided project and a daily AI Mentor allowance. The free version shows ads. • Pro: every course, mission and project, the certificate exam, unlimited AI Mentor and no ads. Choose weekly, monthly, yearly or a one-time lifetime purchase. Ruby on Rails is a trademark of David Heinemeier Hansson. This app is independent and is not affiliated with or endorsed by the Rails project.