How to Make Bad Source

2019/04/19 RubyKaigi 2019 LT

Transcript

1. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. RubyKaigi 2019 LT ODA Hirohito How to Make Bad Source !1
2. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. What is Bad Source? !2
3. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. What is a Bad Source? !3 Spaghetti Source
4. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. What is a Bad Source? !4 I dare to make bad source.
5. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. What is a Bad Source? !5
6. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. What is a Bad Source? !6 • hazama_kuroo https://rubygems.org/gems/hazama_kuroo https://github.com/jinroq/hazama_kuroo • This gem is for playing blackjack with very simple rules.
7. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Motivation !7 • I was moved by a great event named 
 TRICK 2018. https://github.com/tric/trick2018
8. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Abstract of This Talk !8 How a newbie, non-specialist(me) made source code like TRICK.
9. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 1. !9
10. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 1. !10 • Implement a simple rule blackjack.
 (This is ver. 0.2)
11. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 2. !11
12. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 2. !12 • Set a constraint that 
 “Do not change the specifications of Step 1 as much as possible.” • Prepare multiple patterns of ASCII art.
13. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 2. !13 • Set a constraint that 
 “Do not change the specifications of Step 1 as much as possible.” • Prepare multiple patterns of ASCII art.
14. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 2. !14 • Set a constraint that 
 “Do not change the specifications of Step 1 as much as possible.” • Prepare multiple patterns of ASCII art.
15. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 2. !15 • Set a constraint that 
 “Do not change the specifications of Step 1 as much as possible.” • Prepare multiple patterns of ASCII art. selected
16. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 2. !16 • Rewrite the Step 1. source code with a one-liner:
 eval %w[ ].join(‘’)
17. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 3. !17
18. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 3. !18 • Create a prototype.
 (This is ver. 0.2.2)
19. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 3. !19 • Create a prototype.
 (This is ver. 0.2.2) • typo • There are some bugs.
20. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 4. !20
21. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 4. !21 • Second challenge.
 (This is ver. 0.2.3)
22. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. • Second challenge.
 (This is ver. 0.2.3) Step 4. !22
23. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. • Second challenge.
 (This is ver. 0.2.3) Step 4. !23 But…
24. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 4. !24
25. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 5. !25
26. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 5. !26 • Third challenge.
 (This is ver. 0.2.4)
27. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 5. !27 • Third challenge.
 (This is ver. 0.2.4) • Added a feature:

28. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Step 5. !28 • Third challenge.
 (This is ver. 0.2.4) • Added a feature:
 Colored characters to improve usability.
29. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Hey, isn’t it easy? !29
30. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Conclusion !30 • Finalists of TRICK 2018 are very crazy. • I wish a revival of TRICK. • Let’s do it together, because it’s fun! • If you want to hear the details, catch up with me at Drinkup!
31. Copyright © 2019 i³ Systems, Inc. All Rights Reserved. Thank you!! !31