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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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View syllabusRuby playground

4,899+ codders enrolled

144 lessons122 challenges866 quiz questions

  • 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

    Variables and Data Types

    7 lessons750

    Operators Part 1

    5 lessons534

    Operators Part 2

    5 lessons534

    Decision Making

    5 lessons533

    Basic IO

    8 lessons850

    Bill Split Calculator

    Project5 lessons1

    Loops

    9 lessons960

    Methods

    6 lessons634

    FizzBuzz with a Twist

    Project4 lessons1

    Arrays

    7 lessons744

    Iterating Over Collections

    4 lessons434

    Arrays Advanced

    4 lessons435

    Hashes

    6 lessons644

    Daily Expense Tracker

    Project7 lessons1

    Final Challenges

    3 lessons3
  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

    Ranges

    4 lessons425

    2D Arrays

    5 lessons534

    Blocks, Procs & Lambdas

    6 lessons641

    Enumerable Powerhouse

    7 lessons752

    Project - Library Manager

    Project5 lessons139

    Hashes Part 2

    5 lessons535

    Advanced Decision Making

    5 lessons535

    Error Handling

    5 lessons534

    Project - Student Records

    Project6 lessons146

    Final Challenges

    3 lessons322

Ruby courses

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

Interview PreparationData StructuresGraph Algorithms Courses

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!

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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

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

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

Hash Tables - Data Structures Series #4

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

Data Structures
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Certificate on completion

  • 14
  • 12

Linked List - Data Structures Series #5

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

Data Structures
certificate icon

Certificate on completion

  • 14
  • 6
  • 1
See all 43 Ruby courses →
What you get
Everything you'll use to learn to code

Learn by Doing

Write real code, query databases, build websites, and master AI prompts. Our interactive lessons cover every skill modern developers need.

playground.js
Code Editor
1const greeting = "Hello, Coddy!"
2function sayHi(name) {
3    return greeting + " " + name
4}
5
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Input
"Alex"
Output
"Hello, Coddy! Alex"

Build Your Coding Streak

Stay consistent and watch your progress grow! Track your daily coding habit, protect your streak with freeze days, and earn rewards for showing up every day.

12 days streak

Return tomorrow to keep your streak!

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January 2026

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Double or Nothing

Day 5 of 7

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Streak Freeze

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Code Anywhere, Anytime

Take your coding journey on the go! No setup, no downloads - just open and start coding. Available on iOS, Android and Web with 4.9 star ratings.

Python
7Streak
250Score
5Energy
Variables
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CONTINUE
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Journey
Goals
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Rating

You're Not Alone in This

Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Coding is better with friends!

Challenger League
Challenger LeagueTop 7 advance
leaderboard First icon1
avatar 1 icon
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Alex7+ Days
2840
leaderboard Second icon2
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Jordan7+ Days
2650
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Sam7+ Days
2420
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Casey
2180
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Morgan7+ Days
1950
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Every way to learn

Read, listen, test yourself, ask the AI, or look up anything you've already covered. Every lesson meets you where you are.

Intro to Variables
Audio

A variable is a named container that stores a value you can reference later in your program.

In Python, you create one by writing the name, an equals sign, then the value you want to store.

The value can change over time - reassigning the name simply points it to a new value.

1xSarah

Prove Your Skills

Earn certificates for every course you complete. Add them to your LinkedIn profile and resume to showcase your coding expertise to employers.

CoddyCertificate of Completion
This certifies thatJohn Doehas successfully completed
PythonPython Fundamentals
Verified
DateJan 2026
LinkedInAdd to LinkedIn

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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Learn Ruby with Coddy

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