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Ruby Language Foundations💎

Beginner→Intermediate

Ruby 4.0

Master the elegant syntax and core philosophy of Ruby. From basic objects to advanced Enumerable patterns and modern Ruby 4.0 features including Set as a core class and Array#rfind, plus Ruby 3.4's chilled string literals.

7

Sections

28

Lessons

21

Challenges

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28 lessons and 21 challenges, all 100% free.

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Everything is an Object

Method Calls & Parentheses

Symbols vs Strings

Object Classes(Sign in required)

Beginner+10 Mana

Truthiness and Falsiness

Understanding Truthiness(Sign in required)

Beginner+10 Mana

Safe Navigation Operator(Sign in required)

Beginner+10 Mana

Arrays, Hashes & Ranges

Set: A Core Class in Ruby 4.0

Hash with Default Value(Sign in required)

Intermediate+20 Mana

The Enumerable Contract

Set Operations(Sign in required)

Intermediate+20 Mana

New Array Methods in Ruby 4.0

Enumerable Contract(Sign in required)

Beginner+10 Mana

Explicit Block Parameters

Procs vs Lambdas

Lambda vs Proc Behavior(Sign in required)

Intermediate+20 Mana

Symbol to Proc(Sign in required)

Beginner+10 Mana

Closures and Variable Scope

Proc Argument Handling(Sign in required)

Intermediate+20 Mana

Classes and Instances

Modules & Mixins

Module Mixin Order(Sign in required)

Intermediate+20 Mana

Access Control (Private/Protected)

Attribute Accessors(Sign in required)

Beginner+10 Mana

Inheritance vs Composition

Include vs Extend(Sign in required)

Intermediate+20 Mana

Pattern Matching

Rightward Assignment & One-Line Methods

Pattern Matching Syntax(Sign in required)

Beginner+10 Mana

Keyword Arguments

Endless Method Syntax(Sign in required)

Beginner+10 Mana

Data Class Behavior(Sign in required)

Intermediate+20 Mana

The Exception Hierarchy

Custom Exceptions

Default Rescue Type(Sign in required)

Beginner+10 Mana

Ensure, Retry & Raise

Exception Block Order(Sign in required)

Intermediate+20 Mana

Exception Best Practices

Retry Count(Sign in required)

Intermediate+20 Mana

Regular Expressions

Capturing Groups & Named Captures

String Methods & Ruby 4.0 Improvements

Finding All Matches(Sign in required)

Beginner+10 Mana

Regex Named Captures(Sign in required)

Intermediate+20 Mana

String Immutability & Performance

Frozen String Effects(Sign in required)

Intermediate+20 Mana

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28 interactive lessons and 21 hands-on challenges — learn in VS Code, Cursor, or the web.