Overkill

When is it okay to build an orbital laser to destroy an ant-hill?

Many cry "overkill" when design principles are applied to trivial problems. And for good reason: in the context of work, excessive embellishment gets us into trouble. Complexity costs us time and money.

This talk explores how stepping outside of the realm of work and applying outrageous engineering practices to toy problems can deepen our understanding of the trade-offs that we make. Comically simple problems provide the perfect ground for developing actionable heuristics which can be applied to those monstrous complexities that we face in the real world.

Transcript

1. Katrina Owen @kytrinyx http://exercism.io Overkill
3. 1 2 ... 3563 3564 class Thing #... end /app/models/thing.rb
4. <rant>
5. Oh. Shit.
6. 1 2 ... 3563 3564 class Thing #... end /app/models/thing.rb
7. 1 2 ... 3532 3533 class Thing #... end /app/models/thing.rb
8. something different
9. README
10. README Bob is a lackadaisical teenager. In conversation, his responses are very limited.
11. README
12. README Bob answers 'Sure.' if you ask him a question. He answers 'Whoa, chill out!' if you yell at him. He says 'Fine. Be that way!' if you address him without actually saying anything. He answers 'Whatever.' to anything else.
13. test suite
14. test suite
15. test suite "Does this cryogenic chamber make me look fat?" Sure.
16. test suite
17. test suite "WATCH OUT!" Whoa, chill out!
18. test suite
19. test suite "" Fine. Be that way!
20. test suite
21. test suite "Tom-ay-to, tom-aaaah-to." Whatever.
22. edge cases test suite
23. test suite
24. test suite "Ending with ? means a question." Whatever.
25. test suite
26. test suite "I HATE YOU" Whoa, chill out!
27. test suite
28. test suite "Let's go make out behind the gym!" Whatever.
29. test suite
30. test suite "WHAT THE HELL WERE YOU THINKING?" Whoa, chill out!
31. test suite
32. test suite "1, 2, 3" Whatever.
33. test suite
34. test suite "1, 2, 3 GO!" Whoa, chill out!
35. test suite
36. test suite "4?" Sure.
37. test suite
38. test suite "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" Whoa, chill out!
39. code
40. code 24 iterations
41. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." Iteration #1
42. return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno return"Whatever." end end end Iteration #1
43. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end Iteration #1
44. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end Iteration #1
45. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end Iteration #1
46. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end Iteration #1
47. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end Iteration #1
48. Iteration #1 class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end
49. class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return "Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input == "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input == "" return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return "Whatever." end end end Iteration #1 class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input =="1, 2, 3" return "Whatever." elsif input=="4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return"Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input== "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input=="" return"Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input==" " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return"Whatever." end end end
50. take-away #1
51. take-away #1 whitespace is meaningful
52. Iteration #2 class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure."
53. Iteration #2 class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return "Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input == "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input == "" return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return "Whatever." end end end
54. Iteration #2 class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return "Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input == "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input == "" return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return "Whatever." end end end
55. Iteration #2 class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return "Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input == "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input == "" return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return "Whatever." end end end
56. Iteration #2 class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return "Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input == "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input == "" return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return "Whatever." end end end
57. Iteration #2 class Bob def hey(input) case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end end end class Bob def hey(input) if input == "Tom-ay-to, tom-aaaah-to." return "Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input == "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." elsif input == "WHAT THE HELL WERE YOU THINKING?" return "Whoa, chill out!" elsif input == "1, 2, 3 GO!" return "Whoa, chill out!" elsif input == "1, 2, 3" return "Whatever." elsif input == "4?" return "Sure." elsif input == "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" return "Whoa, chill out!" elsif input == "I HATE YOU" return "Whoa, chill out!" elsif input == "Ending with ? means a question." return "Whatever." elsif input == "Wait! Hang on. Are you going to be OK?" return "Sure." elsif input == "" return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == " " return "Fine. Be that way!" elsif input == "Does this cryogenic chamber make me look fat?\nno" return "Whatever." end end end
58. take-away #2
59. take-away #2 minimize boilerplate
60. Iteration #3 class Bob def hey(input) case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?"
61. Iteration #3 case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end
62. Iteration #3 case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end
63. Iteration #3 case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end
64. Iteration #3 case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end
65. Iteration #3 case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end
66. Iteration #3 case input when "Tom-ay-to, tom-aaaah-to." "Whatever." when "WATCH OUT!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?" "Sure." when "You are, what, like 15?" "Sure." when "Let's go make out behind the gym!" "Whatever." when "It's OK if you don't want to go to the DMV." "Whatever." when "WHAT THE HELL WERE YOU THINKING?" "Whoa, chill out!" when "1, 2, 3 GO!" "Whoa, chill out!" when "1, 2, 3" "Whatever." when "4?" "Sure." when "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?\nno" "Whatever." when "I HATE YOU" "Whoa, chill out!" when "Ending with ? means a question." "Whatever." when "Wait! Hang on. Are you going to be OK?" "Sure." when "" "Fine. Be that way!" when " " "Fine. Be that way!" when " " "Fine. Be that way!" end
67. Iteration #3 class Bob def hey(input) case input when "Tom-ay-to, tom-aaaah-to.", "Let's go make out behind the gym! "Whatever." when "WATCH OUT!", "WHAT THE HELL WERE YOU THINKING?", "1, 2, 3 GO! "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?", "You are, wha "Sure." when "", " ", " " "Fine. Be that way!" end end end
68. Iteration #3 ic chamber make me look fat?\nno", "Ending with ? means a question."
69. there I fixed it!
70. take-away #3
71. take-away #3 don’t repeat yourself (DRY)
72. Iteration #4 class Bob def hey(input) case input when "Tom-ay-to, tom-aaaah-to.", "Let's go make out behind the gym! "Whatever." when "WATCH OUT!", "WHAT THE HELL WERE YOU THINKING?", "1, 2, 3 GO! "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?", "You are, wha "Sure." when "", " ", " " "Fine. Be that way!" end end end
73. Iteration #4 class Bob def hey(input) case input when "Tom-ay-to, tom-aaaah-to.", "Let's go make out behind the gym!", "It's OK if you don't want to go to the DMV.", "1, 2, 3", "Does this cryogenic chamber make me look fat?\nno", "Ending with ? means a question." "Whatever." when "WATCH OUT!", "WHAT THE HELL WERE YOU THINKING?", "1, 2, 3 GO!", "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!", "I HATE YOU" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?", "You are, what, like 15?", "4?", "Wait! Hang on. Are you going to be OK?" "Sure." when "", " ", " " "Fine. Be that way!" end end end
74. Iteration #4 "Sure." when "", " ", " " "Fine. Be that way!" end end end
75. Iteration #4 "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?", "You are, what, like 15?", "4?", "Wait! Hang on. Are you going to be OK?" "Sure." when "",
76. Iteration #4 "Whatever." when "WATCH OUT!", "WHAT THE HELL WERE YOU THINKING?", "1, 2, 3 GO!", "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!", "I HATE YOU" "Whoa, chill out!" when "Does this cryogenic chamber make me look fat?",
77. Iteration #4 case input when "Tom-ay-to, tom-aaaah-to.", "Let's go make out behind the gym!", "It's OK if you don't want to go to the DMV.", "1, 2, 3", "Does this cryogenic chamber make me look fat?\nno", "Ending with ? means a question." "Whatever." when "WATCH OUT!",
78. Iteration #5 class Bob def hey(input) return "Whoa, chill out!" if input =~ /\A[\dA-Z\s\W]+\z/ and input =~ /[A-Z]/ return "Sure." if input.split("").last == "?" return "Fine. Be that way!" if input.strip == "" "Whatever." end end
79. take-away #4
80. take-away #4 find the abstraction
81. Iteration #5 class Bob def hey(input) return "Whoa, chill out!" if input =~ /\A[\dA-Z\s\W]+\z/ and input =~ /[A-Z]/ return "Sure." if input.split("").last == "?" return "Fine. Be that way!" if input.strip == "" "Whatever." end end
82. Iteration #5 class Bob def hey(input) return "Whoa, chill out!" if input =~ /\A[\dA-Z\s\W]+\z/ and input =~ /[A-Z]/ return "Sure." if input.split("").last == "?" return "Fine. Be that way!" if input.strip == "" "Whatever." end end
83. Iteration #5 input =~ /\A[\dA-Z\s\W]+\z/ and input =~ /[A-Z]/
84. input == input.upcase Iteration #5
85. input == input.upcase and input != input.downcase Iteration #5
86. Iteration #5 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase and input != input.downcase return "Sure." if input.split("").last == "?" return "Fine. Be that way!" if input.strip == "" "Whatever." end end
87. Iteration #5 input.split("").last == "?"
88. Iteration #5 input.end_with?("?")
89. Iteration #5 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase and input != input.downcase return "Sure." if input.end_with?("?") return "Fine. Be that way!" if input.strip == "" "Whatever." end end
90. Iteration #5 input.strip == ""
91. input.strip.empty? Iteration #5
92. take-away #5
93. take-away #5 seek fluency
94. Iteration #6 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase and input != input.downcase return "Sure." if input.end_with?("?") return "Fine. Be that way!" if input.strip.empty? "Whatever." end end
95. input == input.upcase and input != input.downcase So expressive!
96. and control flow operator
97. && boolean operator
98. boolean vs control flow hungry? && thirsty?
99. rich? && famous? boolean vs control flow
100. sing and dance boolean vs control flow
101. rise and shine boolean vs control flow
102. boolean vs control flow if hungry? && thirsty? eat and drink and be_merry! end
103. Iteration #6 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase and input != input.downcase return "Sure." if input.end_with?("?") return "Fine. Be that way!" if input.strip.empty? "Whatever." end end
104. Iteration #6 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase && input != input.downcase return "Sure." if input.end_with?("?") return "Fine. Be that way!" if input.strip.empty? "Whatever." end end
105. take-away #6
106. take-away #6 familiar isn’t always correct
107. Iteration #7 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase && input != input.downcase return "Sure." if input.end_with?("?") return "Fine. Be that way!" if input.strip.empty? "Whatever." end end
108. Iteration #7 class Bob def hey(input) return "Whoa, chill out!" if input == input.upcase && input != input.downcase return "Sure." if input.end_with?("?") return "Fine. Be that way!" if input.strip.empty? "Whatever." end end
109. Iteration #7 class Bob def hey(input) case when input == input.upcase && input != input.downcase "Whoa, chill out!" when input.end_with?("?") "Sure." when input.strip.empty? "Fine. Be that way!" else "Whatever." end end end
110. take-away #7
111. take-away #7 shorter is better, unless it means something else
112. Iteration #8 class Bob def hey(input) case when input == input.upcase && input != input.downcase "Whoa, chill out!" when input.end_with?("?") "Sure." when input.strip.empty? "Fine. Be that way!" else "Whatever." end end end
113. Iteration #8 class Bob def hey(input) @input = input case when all_caps? then "Whoa, chill out!" when question? then "Sure." when empty? then "Fine. Be that way!" else "Whatever." end end def empty? @input.strip.empty? end def question? @input.end_with?("?") end def all_caps? @input == @input.upcase && @input != @input.downcase end end
114. a what-now? all_caps? question? empty?
115. a what-now? all_caps? question? empty? ➔ shout?
116. a what-now? all_caps? question? empty? ➔ shout? ➔ silence?
117. a what-now? shout? question? silence?
118. take-away #8
119. take-away #8 hide the fiddly details
120. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
121. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
122. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
123. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
124. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
125. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
126. Iteration #9 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
127. take-away #9
128. take-away #9 make the public API coherent
129. Iteration #10 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
130. Iteration #10 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private def silence? @input.strip.empty? end def question? @input.end_with?("?") end def shout? @input == @input.upcase && @input != @input.downcase end end
131. Iteration #10 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private attr_reader :input def silence? input.strip.empty? end def question? input.end_with?("?") end def shout? input == input.upcase && input != input.downcase end end
132. take-away #10
133. take-away #10 send a message
134. Iteration #11 class Bob def hey(input) @input = input case when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private attr_reader :input def silence? input.strip.empty? end def question? input.end_with?("?") end def shout? input == input.upcase && input != input.downcase end end
135. confusion ensues B A
136. confusion ensues B A "ARE YOU CRAZY?"
137. "ARE YOU CRAZY?" @input confusion ensues B A "ARE YOU CRAZY?"
138. "ARE YOU CRAZY?" @input confusion ensues B A "ARE YOU CRAZY?" C "You’re late."
139. @input "You’re late." confusion ensues B A "ARE YOU CRAZY?" C "You’re late."
140. confusion ensues B A
141. @input "You’re late." confusion ensues B A
142. @input "You’re late." confusion ensues "Whatever." B A
143. private attr_reader :input def silence? input.strip.empty? end ... Iteration #11
144. private attr_reader :input def silence? input.strip.empty? end ... Iteration #11 private def silence? ->(s) { s.strip.empty? } end ...
145. take-away #11
146. take-away #11 fleeting state doesn’t belong in instance variables
147. Iteration #12 class Bob def hey(input) case input when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private def silence? ->(s) { s.strip.empty? } end def question? ->(s) { s.end_with?("?") } end def shout? ->(s) { s == s.upcase && s != s.downcase } end end
148. special case case age when ->(i) { i < 13 } then "kiddo" when ->(i) { i % 25 == 0 } then "quarter" when ->(i) { i % 10 == 0 } then "decade" end
149. Iteration #12 class Bob def hey(input) case input when shout? then "Whoa, chill out!" when question? then "Sure." when silence? then "Fine. Be that way!" else "Whatever." end end private def silence? ->(s) { s.strip.empty? } end def question? ->(s) { s.end_with?("?") } end def shout? ->(s) { s == s.upcase && s != s.downcase } end end
150. truth def question? ->(s) { s.end_with?("?") } end
151. Proc.new{ false } truth
152. truth
153. !!Proc.new{ false } # => true truth
154. private def silence? ->(s) { s.strip.empty? } end def question? ->(s) { s.end_with?("?") } end def shout? ->(s) { s == s.upcase && s != s.downcase } end Iteration #12
155. private def silence? ->(s) { s.strip.empty? } end def question? ->(s) { s.end_with?("?") } end def shout? ->(s) { s == s.upcase && s != s.downcase } end Iteration #12 private def silence?(s) s.strip.empty? end def question?(s) s.end_with?("?") end def shout?(s) s == s.upcase && s != s.downcase end
156. take-away #12
157. take-away #12 don’t lie
158. Iteration #13 class Bob def hey(input) case when shout?(input) then "Whoa, chill out!" when question?(input) then "Sure." when silence?(input) then "Fine. Be that way!" else "Whatever." end end private def silence?(s) s.strip.empty? end def question?(s) s.end_with?("?") end def shout?(s) s == s.upcase && s != s.downcase end end
159. Iteration #13 class Bob def hey(input) case when shout?(input) then "Whoa, chill out!" when question?(input) then "Sure." when silence?(input) then "Fine. Be that way!" else "Whatever." end end private def silence?(s) s.strip.empty? end def question?(s) s.end_with?("?") end def shout?(s) s == s.upcase && s != s.downcase end end
160. Iteration #13 class Bob def hey(input) case when shout?(input) then "Whoa, chill out!" when question?(input) then "Sure." when silence?(input) then "Fine. Be that way!" else "Whatever." end end private def silence?(s) s.strip.empty? end def question?(s) s.end_with?("?") end def shout?(s) s == s.upcase && s != s.downcase end end
161. Iteration #13 class Bob def hey(input) case when shout?(input) then "Whoa, chill out!" when question?(input) then "Sure." when silence?(input) then "Fine. Be that way!" else "Whatever." end end private def silence?(s) s.strip.empty? end def question?(s) s.end_with?("?") end def shout?(s) s == s.upcase && s != s.downcase end end
162. Iteration #13 class Bob def hey(input) case when input.shout? then "Whoa, chill out!" when input.question? then "Sure." when input.silence? then "Fine. Be that way!" else "Whatever." end end end class String def silence? strip.empty? end def question? end_with?("?") end def shout? self == upcase && self != downcase end end
163. take-away #13
164. take-away #13 make your objects cohesive
165. Iteration #14 class Bob def hey(input) case when input.shout? then "Whoa, chill out!" when input.question? then "Sure." when input.silence? then "Fine. Be that way!" else "Whatever." end end end class String def silence? strip.empty? end def question? end_with?("?") end def shout? self == upcase && self != downcase end end
166. String API
167. String API #downcase #gsub #reverse #scan #squeeze #to_i ...
168. String API #downcase #gsub #reverse #scan #squeeze #to_i ... #question? #shout? #silence?
169. Iteration #14 class Bob def hey(input) case when input.shout? then "Whoa, chill out!" when input.question? then "Sure." when input.silence? then "Fine. Be that way!" else "Whatever." end end end class String def silence? strip.empty? end def question? end_with?("?") end def shout? self == upcase && self != downcase end end
170. Iteration #14 class Bob def hey(input) input = Input.new(input) case when input.shout? then "Whoa, chill out!" when input.question? then "Sure." when input.silence? then "Fine. Be that way!" else "Whatever." end end end class Input < String def silence? strip.empty? end def question? end_with?("?") end def shout? self == upcase && self != downcase end end
171. take-away #14
172. take-away #14 no, really, make ALL your objects cohesive
173. Iteration #15 class Bob def hey(input) input = Input.new(input) case when input.shout? then "Whoa, chill out!" when input.question? then "Sure." when input.silence? then "Fine. Be that way!" else "Whatever." end end end class Input < String def silence? strip.empty? end def question? end_with?("?") end def shout? self == upcase && self != downcase end end
174. Input API #downcase #gsub #reverse #scan #squeeze #to_i ... #question? #shout? #silence?
175. class DazzlingString < String def sparkle "**;* #{self} **;**" end end beware!
176. s = DazzlingString.new("unicorn") beware!
177. beware!
178. beware! s.sparkle # => **;* unicorn **;**
179. beware! s.sparkle # => **;* unicorn **;** s.upcase # => UNICORN
180. beware! s.sparkle # => **;* unicorn **;** s.upcase # => UNICORN s << 's' # => "unicorns"
181. beware! s.sparkle # => **;* unicorn **;** s.upcase # => UNICORN s << 's' # => "unicorns" s.sparkle # => **;* unicorns **;**
182. beware!
183. s1 = DazzlingString.new("unicorn") beware!
184. s1 = DazzlingString.new("unicorn") s2 = DazzlingString.new("rainbow") beware!
185. beware!
186. s1.sparkle # => **;* unicorn **;** s2.sparkle # => **;* rainbow **;** beware!
187. beware!
188. beware! s3 = s1 + s2 # => "unicornrainbow"
189. beware! s3.sparkle # => undefined method `sparkle' for "unicornrainbow":String (NoMethodError) s3 = s1 + s2 # => "unicornrainbow"
190. Iteration #15 class Bob # ... end class Input < String def silence? strip.empty? end def question? end_with?("?") end def shout? self == upcase && self != downcase end end
191. Iteration #15 class Bob # ... end class Input attr_reader :input def initialize(input) @input = input end def silence? input.strip.empty? end def question? input.end_with?("?") end def shout? input == input.upcase && input != input.downcase end end
192. Input API #question? #shout? #silence?
193. Input API #question? #shout? #silence? #downcase #gsub #reverse #scan #squeeze #to_i ...
194. take-away #15
195. take-away #15 no, really, seriously, f’reals make your objects cohesive
196. Iteration #16 class Bob def hey(input) input = Input.new(input) case # ... end end end class Input attr_reader :input def initialize(input) @input = input end def silence? input.strip.empty? end def question? input.end_with?("?") end def shout? input == input.upcase && input != input.downcase end end
197. Iteration #16 class Bob def hey(input) input = Input.new(input) case # ... end end end class Input attr_reader :input def initialize(input) @input = input end def silence? input.strip.empty? end def question? input.end_with?("?") end def shout? input == input.upcase && input != input.downcase end end
198. naming class String # ... end
199. naming class Input # ... end
200. naming class Analyzer # ... end
201. naming class Parser # ... end
202. naming class Classifier # ... end
203. naming class Message # ... end
204. naming class Comment # ... end
205. naming class Statement # ... end
206. naming class Utterance # ... end
207. naming class Confrontation # ... end
208. naming class Drivel # ... end
209. naming class Blathering # ... end
210. naming class Interpretation # ... end
211. naming class Tone # ... end
212. naming class Perception # ... end
213. point of view shout? question? silence?
214. point of view shout? question? silence? ➔ freaking_out? ➔ dumb_question? ➔ cold_shoulder?
215. naming class Remark # ... end
216. Iteration #16 class Bob def hey(remark) remark = Remark.new(remark) case # ... end end end class Remark attr_reader :remark def initialize(remark) @remark = remark end def silence? remark.strip.empty? end def question? remark.end_with?("?") end def shout? remark == remark.upcase && remark != remark.downcase end end
217. Iteration #16 class Bob def hey(remark) remark = Remark.new(remark) case # ... end end end class Remark attr_reader :remark def initialize(remark) @remark = remark end def silence? remark.strip.empty? end def question? remark.end_with?("?") end def shout? remark == remark.upcase && remark != remark.downcase end end
218. echoes remark = Remark.new(remark) remark.remark
219. echoes host = host.host if host.host?
220. echoes member.member.member
221. echoes var srcData = data; if (data.data && data.data.data) { data = data.data.data; } else if (data.data) { data = data.data; } if (!data) { return; }
222. echoes remark = Remark.new(remark) remark.remark
223. echoes remark = Remark.new(text) remark.text
224. take-away #16
225. take-away #16 naming is hard
226. Final Solution class Bob def hey(text) remark = Remark.new(text) case # ... end end end class Remark attr_reader :text def initialize(text) @text = text end def silence? text.strip.empty? end def question? text.end_with?("?") end def shout? text == text.upcase && text != text.downcase end end case when remark.shout? then "Whoa, chill out!" when remark.question? then "Sure." when remark.silence? then "Fine. Be that way!" else "Whatever." end
227. class Bob def hey (input ) if input=="Tom-ay-to, tom-aaaah-to." return"Whatever." elsif input == "WATCH OUT!" return "Whoa, chill out!" elsif input == "Does this cryogenic chamber make me look fat?" return "Sure." elsif input== "You are, what, like 15?" return "Sure." elsif input == "Let's go make out behind the gym!" return "Whatever." elsif input == "It's OK if you don't want to go to the DMV." return "Whatever." Initial Solution
228. practice toy problems
229. <3 thank you
230. credits Simple Made Easy http://www.infoq.com/presentations/Simple-Made-Easy Rich Hickey 5 elements of Effective Thinking Michael Starbird, Edward Burger Smalltalk Implementation Patterns Kent Beck Mark by Mark http://vimeo.com/79530470 Sarah Gray
231. The Devil is in the Details Katrina Owen @kytrinyx http://exercism.io