Where Bad Code Comes From

Presentation for the ACE! 2012 conference in Kraków

Transcript

1. Where Bad Code Comes From? June 2012
2. I’m Marcin Floryan http://marcin.floryan.pl
3. Energized Work @mfloryan Value, Flow, Quality You can find me at:
4. The ACE Conference: This presentation: #aceconf #mfbadcode
5. Acceptance criteria You can give examples of different sources of bad code You have identified one new reason for bad code you didn’t pay attention to before You will consider a way to tackle it ☐ ☐ ☐
6. Any developers in the room?
7. Seen any bad code?
8. ? Experienced
10. ? how bad can it get
11. Mariner 1 $18.5 million
12. Hartford Coliseum $80 million
13. Ariane 5 $500 million
14. “One  bug,  one  crash.  Of  all   the  careless  lines  of  code   this  one  may  stand  as  the   most  devastatingly efficient.   James Gleick
15. North America black-out 55 million people
16. “To  err  is  human,  but  to   really  foul  things  up  you   need  a  computer.   Paul Ehrlich
17. Does your code resemble
18. or this…?
19. Building
21. Building
23. what how code
24. “When  people  are   factored  in,     nothing  is  simple.   Ken Schwaber
25. what how who code
27. “A post-modern firm is rich in information and relies heavily on the daily choices of its knowledgeable employees. Haridimos Tsoukas
28. Let’s go back in time
32. What’s that rustling in the bushes?
34. FIGHT
35. You’re fed
36. What’s that rustling in the bushes?
38. F IGHT L
39. You’re safe
40. back to reality
41. How about that RAG report?
42. Running late?
43. Add more people
44. Even more late * *  Consult  the  Brooks  Law  for  details  
45. How about that RAG report?
46. Already over budget?
47. Let’s squeeze the testing
48. What do you mean quality?
49. But it worked so well
50. Do you ever fly?
51. ? a novice pilot
52. or perhaps even
53. Welcome aboard KLM Flight 4805
54. A bomb in a flower shop
55. Landing at Tenerife
56. law mandated rest period looming
57. decision to re-fuel
58. and a T H I C K fog
59. KLM 747 crashes
60. Communication misunderstandings deadliest accident in aviation history
61. Junior pilots any better? remember Air France flight 447
62. so how about
63. ? Ever worked
64. ? Ever worked
65. ? Ever worked
66. meet Bob*
67. “Good, safe social interaction is as necessary to successful development as good technical skills Kent Beck
68. Difficult Conversations
69. Recognise
70. How do we tell… our tester you let all these nasty bugs through
71. How do we tell… a new developer you don’t know the framework well enough
72. How do we tell… project manager we are not resources
73. How do we tell… stakeholders your   expectaAons   are   unrealisAc
74. How do we tell… operations we  need  it   live  NOW
75. How do we tell… our client I am unable to add value as a coach
76. we DON’T.
77. instead
78. Time for
79. Ehm… no.
80. I want you to learn
81. “One must learn by doing the thing; for though you think you know it, you have no certainty, until you try. Sophocles
82. so instead
83. some
84. Your job 1.  Find some bad code 2.  Trace it back to a difficult conversation 3.  How could you have done it differently?
85. My example 1.  Data transfer via FTP upload of text files is really clunky 2.  That’s the way things are done around here. We never challenged this. 3.  Ask to understand rationale behind the decision, present viable alternatives
86. Follow-Up •  Catch me, stop me, talk to me •  Contact me on twitter @mfloryan •  Submit and discuss your ideas bit.ly/ace-homework
87. The Remember Slide • We’re not optimised for writing code • Our mental software is mostly legacy code • We don’t talk to each other • We hide our emotions
88. Bibliography
89. So Thank You bit.ly/ace-bad-code
90. Resources •  Hartford Civic Center Arena Roof Collapse http://www.eng.uab.edu/cee/faculty/ndelatte/case_studies_project/Hartford%20Civic%20Center/hartford.htm •  Mariner 1 http://en.wikipedia.org/wiki/Mariner_1 •  Ariane 5 http://www.around.com/ariane.html •  KLM flight 4805 http://en.wikipedia.org/wiki/Tenerife_airport_disaster •  Air France flight 447 http://en.wikipedia.org/wiki/Air_France_Flight_447 •  2003 North America black-out http://en.wikipedia.org/wiki/2003_North_America_blackout •  The Kludge Tweet https://twitter.com/jmeydam/status/143405066571886592
91. Picture Credits •  The Bismuth Cristals based on “Wismut Kristall und 1cm3 Wuerfel” photo by Alchemist-hp from Wikimedia Commons under FreeArt license •  "FIGURE 02.2 The Manifesto for Agile Software Development” from flickr by Jurgen Appelo from flickr licensed under Creative-Commons-by-2.0 license •  "FIGURE 02.3 The Manifesto for Software Craftsmanship” from flickr by Jurgen Appelo from flickr licensed under Creative-Commons-by-2.0 license •  ”bushes" from flickr by Rupert Ganzer under Creative-Commons-by-nd-2.0 license •  ”Cottontail Rabbit" from flickr by Ken Slade under Creative-Commons-by-nc-2.0 license •  “Lion” from flickr by Angela Huxham under Creative-Commons-by-nc-sa-2.0 license •  ”the first standup" photo from flickr by Karthik Chandrasekariah under Creative-Commons-by-nc-2.0 license •  "Traffic light stacking" photo from flickr by fabi42 under Creative-Commons-by-nc-sa-2.0 license •  “Tenerife747s” picture from Wikimedia Commons by Anynobody under Creative Commons by-sa-3.0 license •  The Difficult Conversations picture is by Olaf Lewitz from XP Days Benelux 2012 available on G+ •  The Coaching Dojo picture is from Olaf Lewitz (By Ole) at XP Days Benelux 2012 available on G+ The remaining pictures are used under the fair use policy or available in public domain.
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