Ruby Practice and Notes

A collection of Ruby programming exercises, practice problems, and learning notes.

Structure

• /ruby_lesson_notes - Personal notes and concept explanations
• /pak_test_<number> - Ruby coding exercises, solutions, and associated test files for exercises

Topics Covered

Ruby Fundamentals

• Data Types and Variables
  • Local, Instance, Class, and Global Variables
  • Constants
• String Manipulation and Interpolation
• Arrays and Array Methods
  • Array Shortcuts (%w[])
  • Built-in Methods (push, pop, shift, unshift)
• Hashes (Objects)
  • Creation and Access
  • Nested Hashes and the dig Method
  • Merging Hashes

Control Flow and Methods

• Conditional Statements (if/elsif/else, unless)
• Case Statements
• Modifier Conditionals
• Method Definition and Calling
• Implicit Returns
• User Input with gets.chomp

Object-Oriented Programming

• Classes and Objects
• Instance Methods vs Class Methods
• The initialize Method (Constructor)
• Class Variables and Instance Variables
• Attribute Accessors (attr_reader, attr_writer, attr_accessor)

OOP Design Principles

• SOLID Principles
  • Single Responsibility Principle (SRP)
  • Open/Closed Principle (OCP)
  • Liskov Substitution Principle (LSP)
  • Interface Segregation Principle (ISP)
  • Dependency Inversion Principle (DIP)
• Design Patterns
  • Flexible Interfaces
  • Dependency Injection
  • Composition over Inheritance
• Code Organization
  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism

Blocks, Procs, and Lambdas

• Block Syntax (do...end and {})
• Block Parameters and Variables
• Converting Blocks to Procs
• Understanding Lambda Behavior
• Method Parameters with &block

Pattern Matching

• Regular Expressions Basics
• The =~ Operator
• String Pattern Matching

Resources Used

• Launch School Materials
• Ruby Documentation
• Practice Problem Sets

Notes

This repository serves as a personal reference for Ruby programming concepts and practice exercises. Each concept includes comparisons with JavaScript equivalents to aid in understanding.