Exceptional Ruby

on YouTube ↗42m

" summary

Explains Ruby’s actual raise lifecycle: Ruby calls an object’s exception.exception coercion, then calls set_backtrace, sets the global $! error variable, and unwinds the stack; shows how to override raise and demos the Hammer Time Jam interactive error console. Demonstrates retry, nested exceptions (carry original via an attribute), using at_exit for crash logging, advocating circuit-breakers and contingency methods, and recommends structuring libraries around three classes — user error, logic error, transient error — so callers can choose handling semantics.

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" chapters (50)

1. 0:00Intro
2. 2:11Lifecycle of an Exception
3. 2:23Raising Exceptions
4. 3:15raise with a string
5. 3:48raise is a method on Kernel
6. 4:02Overriding raise
7. 4:42raise internals
8. 5:04Get the exception object
9. 5:35exception()
10. 5:52Implement your own #exception
11. 6:32Set the backtrace
12. 6:42Set global error variable
13. 7:35Unwind the call stack
14. 7:49rescue with no arguments
15. 8:18rescue with just a name
16. 8:40rescue with a class
17. 9:18rescue with a dynamic matcher
18. 10:23ensure with explicit return
19. 10:43retry
20. 11:46raise during exception handling
21. 13:48Re-raise with new message
22. 14:14Failures without context
23. 14:48Adding context
24. 16:03Re-raise with message, backtrace
25. 16:15Re-raise with no arguments
26. 17:30Uncaught exceptions
27. 18:04A simple crash logger
28. 18:58Responding to Failures
29. 19:15Return an error value
30. 19:27Return a benign value
31. 19:59Remote Failure Reporting
32. 22:20Avoid the failure cascade
33. 22:40Your Failure Handling Strategy
34. 23:04Question #1
35. 25:24Question #2
36. 26:06What constitutes an exception?
37. 26:57Caller-defined fallback strategy
38. 28:02Question #4
39. 29:41Isolate exception handling code
40. 29:53begin is a code smell
41. 30:39Method-level exception clauses
42. 31:33Contingency methods
43. 33:01Exception Safety
44. 33:27The Three Guarantees
45. 35:50Tag your library exceptions
46. 39:27User Error
47. 39:53Logic Error
48. 40:04Transient Error
49. 40:33Three essential exception classes
50. 40:55A Recap

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