Section 6: Object-Oriented Craft: Designing with Objects

📄 Section Lessons

• Lesson 1: 6.1 Object Modeling: Encapsulation, State & Accessors

  Object-oriented programming provides the mental model for mapping complex real-world domains into software. Master class design: state encapsulation with instance variables, explicit attribute accessors, and enforcing boundary protection with private interfaces.

  Start Lesson
• Lesson 2: 6.2 Behavioral Composition: Modules, Mixins & Namespaces

  Deep inheritance trees introduce tight coupling and fragile hierarchies. Learn how professional Rubyists favor composition over inheritance using Mixin Modules to share behavior across unrelated classes, and organize domain namespaces.

  Start Lesson
• Lesson 3: 6.3 Polymorphism: Duck Typing & Flexible Interfaces

  Ruby is dynamically typed, freeing developers from rigid interface definitions. Master Duck Typing: designing polymorphic collaborations based on message passing rather than explicit class hierarchies.

  Start Lesson
• Lesson 4: 6.4 Capstone Architecture: Engineering a Robust CLI Application

  Synthesize your object-oriented knowledge by engineering a modular, multi-class Command-Line Interface (CLI) application with strict separation between domain logic, persistence, and interactive user IO.

  Start Lesson