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Learn Ruby

A free, interactive online Ruby course. You write Ruby on every lesson, with AI hints when something raises, and a free certificate of completion when you finish.

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3,933+ codders enrolled

  • Beginner friendly
  • sparkles iconAI-assisted coding help
  • hint iconHands-on interactive lessons
  • volume On iconAudio narration on every lesson
  • quiz iconQuizzes to test your knowledge
  • certificate iconFree certificate of completion

Syllabus

2 sections5 projects144 lessons122 challenges866 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Build a strong foundation with essential concepts and basic skills88 lessons75 challenges469 questions3 projects

    Introduction to Ruby

    3 lessons317
    • 01What is Ruby?Challenge
    • 02Hello WorldChallengeQuiz
    • 03Comments in RubyChallengeQuiz

    Variables and Data Types

    7 lessons750
    • 01Numbers and VariablesChallengeQuiz
    • 02String Data TypeChallengeQuiz
    • 03Boolean Data TypeChallengeQuiz
    • 04Symbol Data TypeChallengeQuiz
    • 05Checking Data TypesChallengeQuiz
    • 06Naming ConventionsChallengeQuiz
    • 07Recap - Variable CreationChallenge

    Operators Part 1

    5 lessons534
    • 01Arithmetic OperatorsChallengeQuiz
    • 02Modulo OperatorChallengeQuiz
    • 03Arithmetic ShortcutsChallengeQuiz
    • 04Recap - Simple MathChallenge
    • 05Comparison OperatorsChallengeQuiz

    Operators Part 2

    5 lessons534
    • 01Logical Operators Part 1ChallengeQuiz
    • 02Logical Operators Part 2ChallengeQuiz
    • 03Recap - Simple LogicChallenge
    • 04Logical Operators Part 3ChallengeQuiz
    • 05Logical Operators Part 4ChallengeQuiz

    Decision Making

    5 lessons533
    • 01If StatementChallengeQuiz
    • 02If - ElseChallengeQuiz
    • 03Recap - Simple CalculatorChallenge
    • 04Nested If - ElseChallengeQuiz
    • 05Unless StatementChallengeQuiz

    Basic IO

    8 lessons850
    • 01Output with putsChallengeQuiz
    • 02Output with print and pChallengeQuiz
    • 03Output With VariablesChallengeQuiz
    • 04Input with getsChallengeQuiz
    • 05Chomp MethodChallengeQuiz
    • 06Type ConversionChallengeQuiz
    • 07Recap - Age CalculatorChallenge
    • 08Recap - True or FalseChallenge

    Bill Split Calculator

    Project5 lessons1
    • 01Welcome MessageChallenge
    • 02Getting User InputProject
    • 03Calculating Tip And TotalProject
    • 04Splitting The BillProject
    • 05Formatted OutputProject

    Loops

    9 lessons960
    • 01For Loop with RangesChallengeQuiz
    • 02While LoopChallengeQuiz
    • 03BreakChallengeQuiz
    • 04NextChallengeQuiz
    • 05Recap - FactorialChallenge
    • 06Times LoopChallengeQuiz
    • 07Until LoopChallengeQuiz
    • 08Nested LoopsChallengeQuiz
    • 09Recap - Dynamic InputChallenge

    Methods

    6 lessons634
    • 01Defining a MethodChallengeQuiz
    • 02Method ParametersChallengeQuiz
    • 03Return ValuesChallengeQuiz
    • 04Recap - Sigma MethodChallenge
    • 05Recap - Validation MethodChallenge
    • 06Default Parameter ValuesChallengeQuiz

    FizzBuzz with a Twist

    Project4 lessons1
    • 01Game OverviewChallenge
    • 02The FizzBuzz MethodProject
    • 03Looping Through NumbersProject
    • 04Adding The TwistProject

    Arrays

    7 lessons744
    • 01Creating ArraysChallengeQuiz
    • 02Accessing Array ElementsChallengeQuiz
    • 03Modifying ArraysChallengeQuiz
    • 04Array MethodsChallengeQuiz
    • 05Recap - Product ArrayChallenge
    • 06Recap - Reversed ArrayChallenge
    • 07Array ShortcutsChallengeQuiz

    Iterating Over Collections

    4 lessons434
    • 01Each IteratorChallengeQuiz
    • 02Each with IndexChallengeQuiz
    • 03Iterating Over StringsChallengeQuiz
    • 04Map and CollectChallengeQuiz

    Arrays Advanced

    4 lessons435
    • 01Array Slicing with RangesChallengeQuiz
    • 02Array Slicing with IndexesChallengeQuiz
    • 03Array OperatorsChallengeQuiz
    • 04Include? MethodChallengeQuiz

    Hashes

    6 lessons644
    • 01Creating HashesChallengeQuiz
    • 02Accessing Hash ElementsChallengeQuiz
    • 03Modifying HashesChallengeQuiz
    • 04Hash MethodsChallengeQuiz
    • 05Recap - Product HashChallenge
    • 06Symbols as Hash KeysChallengeQuiz

    Daily Expense Tracker

    Project7 lessons1
    • 01Project OverviewChallenge
    • 02Exit The ProgramProject
    • 03Add ExpenseProject
    • 04View All ExpensesProject
    • 05Total And AverageProject
    • 06Clear AllProject
    • 07Error HandlingProject

    Final Challenges

    3 lessons3
    • 01Flat Asterisk PyramidChallenge
    • 02Pattern FinderChallenge
    • 03What To BuyChallenge
  2. Section 2

    Logic & Flow

    Start sectionStartExpandCollapse    Develop problem-solving skills in Ruby with strings, blocks, enumerable methods, nested data, and error handling.56 lessons47 challenges397 questions2 projects

    Strings In Depth

    5 lessons534
    • 01String Methods OverviewChallengeQuiz
    • 02String InterpolationChallengeQuiz
    • 03Iterating Over StringsChallengeQuiz
    • 04Split and JoinChallengeQuiz
    • 05Recap - String WeaverChallenge

    Ranges

    4 lessons425
    • 01What is a Range?ChallengeQuiz
    • 02Range MethodsChallengeQuiz
    • 03Ranges in Case / WhenChallengeQuiz
    • 04Recap - Range PracticeChallenge

    2D Arrays

    5 lessons534
    • 012D Array BasicsChallengeQuiz
    • 02Accessing 2D ElementsChallengeQuiz
    • 03Iterating Over 2D ArraysChallengeQuiz
    • 04Common 2D PatternsChallengeQuiz
    • 05Recap - Matrix OperationsChallenge

    Blocks, Procs & Lambdas

    6 lessons641
    • 01What is a Block?ChallengeQuiz
    • 02do..end vs BracesChallengeQuiz
    • 03The yield KeywordChallengeQuiz
    • 04Block ParametersChallengeQuiz
    • 05Procs and LambdasChallengeQuiz
    • 06Recap - Custom IteratorChallenge

    Enumerable Powerhouse

    7 lessons752
    • 01Select and RejectChallengeQuiz
    • 02Chaining MapChallengeQuiz
    • 03Reduce / InjectChallengeQuiz
    • 04count, all?, any?, none?ChallengeQuiz
    • 05group_by and partitionChallengeQuiz
    • 06sort_by, min_by, max_byChallengeQuiz
    • 07Recap - Data PipelineChallenge

    Project - Library Manager

    Project5 lessons139
    • 01Project OverviewChallengeQuiz
    • 02Add BookProjectQuiz
    • 03Search By TitleProjectQuiz
    • 04Filter By GenreProjectQuiz
    • 05Mark As ReadProjectQuiz

    Hashes Part 2

    5 lessons535
    • 01Hash.new with DefaultsChallengeQuiz
    • 02Iterating HashesChallengeQuiz
    • 03Nested HashesChallengeQuiz
    • 04Merging and TransformingChallengeQuiz
    • 05Recap - Frequency CounterChallenge

    Advanced Decision Making

    5 lessons535
    • 01Case with Classes & RegexChallengeQuiz
    • 02Multi-value whenChallengeQuiz
    • 03Ternary OperatorChallengeQuiz
    • 04Inline if / unlessChallengeQuiz
    • 05Recap - Grade ClassifierChallenge

    Error Handling

    5 lessons534
    • 01What is an Exception?ChallengeQuiz
    • 02begin / rescueChallengeQuiz
    • 03Multiple rescue ClausesChallengeQuiz
    • 04ensure and raiseChallengeQuiz
    • 05Recap - Safe CalculatorChallenge

    Project - Student Records

    Project6 lessons146
    • 01Project OverviewChallengeQuiz
    • 02Add StudentProjectQuiz
    • 03Add GradeProjectQuiz
    • 04Average GradeProjectQuiz
    • 05List By CourseProjectQuiz
    • 06Top StudentsProjectQuiz

    Final Challenges

    3 lessons322
    • 01Word AnalyticsChallengeQuiz
    • 02Inventory SnapshotChallengeQuiz
    • 03Data TransformerChallengeQuiz

Ruby courses

Hands-on Ruby courses, free to start in your browser.

Data Structures

Beginner Challenges - Practice Basic Concepts

Popular

Put your beginner coding knowledge to test and try to solve this programming challenges, use any language you want, Happy Coding!

certificate icon

Certificate on completion

  • 20
  • 20

Coding Problems

Popular

Put your programming problem solving skills to the test using the exercises with different difficulties in this course. Designed for coders with some prior knowledge of the basic syntax in any programming language.

certificate icon

Certificate on completion

  • 32
  • 31

Heaps & Priority Queues - Data Structures Series #7

New

In this course, you will learn about the Heap data structure (the backbone of priority queues), create a MinHeap from zero using your preferred language, and practice coding challenges with it!

Data Structures
certificate icon

Certificate on completion

  • 14
  • 6
  • 1

Coding Problems: Volume 2

Put your programming problem solving skills to the test using the exercises with different difficulties in this course. Designed for coders with some prior knowledge of the basic syntax in any programming language. This course is an extension of the first Coding Problems

certificate icon

Certificate on completion

  • 25
  • 24

Star Pattern Bootcamp

Put your programming problem solving skills to learn how to print star patterns range from simple to complex, involving different levels of nested loops, conditional statements, and mathematical calculations.

  • 30
  • 28

Stack - Data Structures Series #1

In this course, you will learn about the Stack data structure, create a Stack from zero using your preferred language, and practice coding challenges with it!

Data Structures
  • 13
  • 6
  • 1
See all 27 Ruby courses →

Why learn Ruby with Coddy

  • Run real Ruby code in your browser. No Ruby install, no rbenv or RVM to configure. Each lesson runs your Ruby script server-side and shows the output instantly.
  • Idiomatic Ruby: variables, control flow, methods, blocks and procs, classes, modules, mixins, exception handling, the standard library. The Ruby foundations every Rails developer needs.
  • AI hints help you read and fix Ruby errors without spoiling the answer, so the language's looser, more expressive style feels natural instead of confusing.
  • Free Ruby programming certificate when you finish the course. A credible signal for Ruby on Rails, backend, and full-stack roles where Ruby fluency is the baseline expectation.

Frequently asked questions about learning Ruby

Is Ruby hard to learn?

Ruby is one of the more beginner-friendly programming languages. The syntax is famously readable, almost like English, and the language was designed with developer happiness in mind. Most beginners build their first working Ruby program within the first hour and reach blocks and classes within a couple of weeks.

What is Ruby programming used for?

Ruby is best known as the language behind Ruby on Rails, the web framework that powers GitHub, Shopify, Airbnb, and many other large applications. Outside Rails, Ruby is widely used for scripting, automation, DevOps tooling, and small command-line utilities. Most people learning Ruby today are aiming at Rails or full-stack web development.

Should I learn Ruby or Python first?

Pick by goal. Python is the broader, more popular choice - strong for data, scripting, and AI. Ruby is the more focused choice if you're aiming at Rails, web startups, or backend roles in companies that use Ruby. The fundamentals transfer in both directions, so neither is a wasted investment.

How long does it take to learn Ruby?

Ruby basics - variables, conditionals, loops, methods - take one to two weeks of daily practice. Becoming comfortable with blocks, classes, modules, and idiomatic Ruby usually takes one to three months. From there, picking up Ruby on Rails is a separate ramp on top of the language itself.

Can I learn Ruby online for free?

Yes. The interactive Ruby course is free - full lessons, coding exercises, quizzes, and a certificate. Ruby runs server-side in a sandboxed environment, so you don't need to install Ruby or set up rbenv locally to start coding.

Do I get a certificate after the Ruby course?

Yes. Finishing the Ruby course gives you a free certificate of completion. A verifiable signal you can add to your resume or share on LinkedIn, especially useful as a stepping stone toward Ruby on Rails or backend developer roles.
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