Ruby

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Last Update	09/18/2026
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Section 1: Getting Started

3Lessons ·
- 1: Installing Ruby and Using irb
  
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- 2: Anatomy of a Ruby Script
  
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Section 2: Core Syntax

5Lessons ·
- 5: Control Flow Statements
  
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Section 3: Methods and Blocks

4Lessons ·
- 10: Blocks, Procs, and Lambdas
  
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Section 4: Object-Oriented Ruby

5Lessons ·
- 13: Classes and Objects
  
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- 14: Modules and Mixins
  
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- 16: Attr Accessors and Encapsulation
  
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- 17: Duck Typing in Ruby
  
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Section 6: Working with Data and Files

4Lessons ·
- 22: File I/O and Exceptions Revisited
  
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- 24: Regular Expressions in Ruby
  
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Section 8: Ecosystem and Testing

3Lessons ·
- 29: Managing Gems with Bundler
  
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Section 9: Practical Projects

5Lessons ·
- 32: Building a Command-Line Ruby Script
  
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- 33: Building a Small Gem
  
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- 34: Building a Basic Sinatra Web App
  
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- 35: Building a Simple File-Based Task Tracker
  
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- 36: Building a Text Processing Tool
  
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Section 11: Data Structures and Algorithms in Ruby

4Lessons ·
- 39: Implementing a Linked List in Ruby
  
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- 40: Implementing a Stack and Queue
  
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- 41: Implementing Common Sorting Algorithms
  
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Section 12: More Practice Exercises

4Lessons ·
- 45: Practice Exercise: Building a Text Adventure Engine
  
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Section 13: Enumerable and Functional Style

4Lessons ·
- 50: Functional-Style Method Chaining
  
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Section 16: Enumerable and Comparable Modules In Depth

5Lessons ·
- 58: The Enumerable Module Methods: map, select, reduce
  
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- 59: each_with_object and each_slice
  
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Section 17: Ruby Standard Library: Core Utilities

6Lessons ·
- 65: Time and Date Classes
  
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- 66: FileUtils for File Operations
  
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- 67: Tempfile for Temporary Files
  
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Section 18: Ruby Standard Library: Data and Security

5Lessons ·
- 72: JSON Module In Depth
  
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- 73: YAML Module In Depth
  
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Section 19: Ruby Standard Library: CLI and Text

4Lessons ·
- 74: OptionParser for CLI Argument Parsing
  
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- 76: StringScanner for Text Parsing
  
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Section 20: Ruby Networking

3Lessons ·
- 79: Building a Simple TCP Server with Socket
  
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- 80: URI Module for Parsing URLs
  
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Section 21: Ruby on Rails Deep Dive

8Lessons ·
- 84: Rails Routing In Depth
  
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Section 22: Ruby Metaprogramming Deep Dive

4Lessons ·
- 92: Building a Simple DSL in Ruby
  
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Section 24: Ruby Concurrency

4Lessons ·
- 98: Threads in Ruby and the GIL
  
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- 101: Mutex and Thread Synchronization
  
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Section 27: Ruby Performance

4Lessons ·
- 113: JIT Compilation in Ruby (YJIT)
  
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Section 29: More Interview Practice

4Lessons ·
- 119: Common Ruby Interview Questions on Modules vs Classes
  
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- 120: Common Ruby Interview Questions on Object Model
  
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- 121: Whiteboard Practice: Implementing a Linked List in Ruby
  
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Section 35: Sinatra and Lightweight Ruby Web Apps

3Lessons ·
- 143: Building a REST API with Sinatra
  
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Section 36: More Ruby Language Deep Dive

5Lessons ·
- 147: The Comparable Module Edge Cases
  
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- 149: Refinements Revisited In Depth
  
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Section 37: Ruby 3.x Modern Features

5Lessons ·
- 151: Ractor for Parallel Execution Revisited
  
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- 152: Rightward Assignment
  
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- 153: Hash Shorthand Syntax
  
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Section 38: More Data Structures in Ruby

5Lessons ·
- 157: Implementing a Trie in Ruby
  
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Section 39: More Practical Projects

5Lessons ·
- 162: Building a Simple Task Management API
  
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Section 40: Ruby Ecosystem Tools

4Lessons ·
- 166: RuboCop for Style Enforcement
  
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- 169: Debugging with Pry and byebug
  
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Section 41: More Practice and Review

4Lessons ·
- 170: Practice Exercise: Building a Custom Validation DSL
  
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Section 46: Ruby Object Model Deep Dive

5Lessons ·
- 190: The Method Resolution Order (Ancestors Chain)
  
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- 191: BasicObject and the Root of the Hierarchy
  
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- 192: Object Equality: ==, eql?, equal?
  
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Section 49: Ruby Data Processing

5Lessons ·
- 202: Processing Large CSV Files Efficiently
  
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Section 58: More Advanced Metaprogramming

5Lessons ·
- 243: Method Chaining and Fluent Interfaces
  
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Section 59: More Final Projects

6Lessons ·
- 246: Building a Simple CRM Backend
  
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- 248: Building a Social Bookmarking Service
  
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- 249: Building a Recipe Sharing Platform API
  
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- 250: Building a Simple Event Ticketing System
  
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