The Case of the Missing Method — A Ruby Mystery Story

on YouTube ↗34m

" summary

Finds that a missing class method isn’t lost but stored on the class’s singleton class, discovered by inspecting ancestry and using a small where method to search ancestors; reproduces the surprise that creating one class increments ObjectSpace to 936 then 938 class objects in IRB; demonstrates tools Pry/IRB, object_space, singleton_class and instance_eval; builds a tiny DSL (city_instance) that scaffolds per-city classes via instance_eval and singleton classes and it works to localize custom behavior.

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" chapters (11)

1. 0:00Introduction
2. 0:30Chapter 1 The Missing Method
3. 3:17Jennys Notes
4. 7:30The Case
5. 11:33Chapter 3 The Missing Method
6. 15:20Chapter 4 Case Closed
7. 16:17Chapter 5 Ellen
8. 18:24Chapter 6 Ellen
9. 23:50Chapter 7 Singletons
10. 27:00Chapter 8 Mike
11. 29:47Chapter 9 Ellen

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