1. Booleans and Enums

  2. Following the Path

  3. Decorating ActiveRecord

  4. Modeling a Paginated API as a Lazy Stream

  5. Testing Third Party Interactions

  6. Learning by helping

  7. Elm's universal pattern

  8. Building custom DOM event handlers in Elm

  9. Composition vs Inheritance

  10. Building Reusable Object-Oriented Systems: Composition