Upgrade to Pro — share decks privately, control downloads, hide ads and more …
Sign up for free

magic-comment-magic.pdf

Avatar for Koichi ITO Koichi ITO
July 18, 2019
Programming
410
1

 magic-comment-magic.pdf

平成.rb #6 (https://heiseirb.connpass.com/event/138210/)

Avatar for Koichi ITO

Koichi ITO

July 18, 2019

More Decks by Koichi ITO

See All by Koichi ITO
The Rails Doctrine Decade
Avatar for Koichi ITO koic
2
570
Reframing the Agile Manifesto
Avatar for Koichi ITO koic
5
4.8k
The NotImplementedError Problem in Ruby
Avatar for Koichi ITO koic
1
2.1k
Exploring RuboCop with MCP
Avatar for Koichi ITO koic
0
8.2k
Ruby and LLM Ecosystem 2nd
Avatar for Koichi ITO koic
1
2.3k
STYLE
Avatar for Koichi ITO koic
1
2.2k
Ruby and LLM Ecosystem
Avatar for Koichi ITO koic
3
14k
Write Code Every Day
Avatar for Koichi ITO koic
1
2.8k
Bliki (ja), and the Cathedral, and the Bazaar
Avatar for Koichi ITO koic
7
3.3k

Other Decks in Programming

See All in Programming
個人開発者よ、Honoを使え（おじさんver）
Avatar for tanahiro2010 tanahiro2010
2
260
設計次第でAIコードの読む量は減らせる / designing-for-code-reading
Avatar for MinoDriven minodriven
35
16k
Web Framework Benchmark Battle 2026, Any%
Avatar for Akira Matsuda a_matsuda
2
1.4k
Unity6 URPによる海底をテーマにしたVJシステムの解説 | Unity Shader 完全に理解した 勉強会
Avatar for がむ gam0022
0
370
Findy - エンジニア向け会社紹介/Findy Company Deck
Avatar for Findy findyinc
6
400k
Agents on Rails - Rails at Scale 2026
Avatar for Irina Nazarova irinanazarova
0
540
[2026-09-26]空論ジェネリックプロセス～テスト資産とAIで紡ぐ、再現可能なパフォーマンスチューニングの話～
Avatar for tosite tosite
0
270
JIS keyboard support in Omarchy
Avatar for LEF lef237
0
110
KiroのSpecで「五目並べ」を作ってみる
Avatar for Satoshi Kaneyasu satoshi256kbyte
1
380
phperだってパンチカードでコーディングしたい
Avatar for hideki kinjyo o0h
PRO
0
320
SalesForceを内製化！？ ~ HR事業を支える顧客管理基盤のインフラを大公開 ~
Avatar for Kobujee_53 oku053
0
170
動作中のプログラムの中身をリアルタイムに覗く / Realtime Debugger for CSharp with Roslyn
Avatar for Prota prota
1
1.9k

Featured

See All Featured
We Are The Robots
Avatar for Honza Javorek honzajavorek
0
400
Navigating Algorithm Shifts & AI Overviews - #SMXNext
Avatar for Aleyda Solis aleyda
1
1.7k
Code Review Best Practice
Avatar for Trisha Gee trishagee
74
20k
SEOcharity - Dark patterns in SEO and UX: How to avoid them and build a more ethical web
Avatar for Sara Fernández Carmona sarafernandez
0
300
Groundhog Day: Seeking Process in Gaming for Health
Avatar for Sebastian Deterding codingconduct
0
410
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
Avatar for Rebecca Miller-Webster rmw
35
3.8k
No one is an island. Learnings from fostering a developers community.
Avatar for Antonio thoeni
21
3.9k
[RailsConf 2023] Rails as a piece of cake
Avatar for Vladimir Dementyev palkan
59
7.1k
Noah Learner - AI + Me: how we built a GSC Bulk Export data pipeline
Avatar for Tech SEO Connect techseoconnect
PRO
0
460
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
Avatar for Tammy Everts tammyeverts
11
1.1k
Distributed Sagas: A Protocol for Coordinating Microservices
Avatar for Caitie McCaffrey caitiem20
333
23k
Collaborative Software Design: How to facilitate domain modelling decisions
Avatar for Kenny Baas-Schwegler baasie
1
340

Transcript

  1.  -PT"OHFMFT

  2.  -PT"OHFMFT

  3.  -PT"OHFMFT ⏰⚡ 5JNFPVU

  4. *GJUEPFTOPUUJNFEPVU

  5.  8FE Magic comment magic ,PJDIJ*50&4. JOD 3VCZ$POG 5IF.JMMFOOJVN#JMUNPSF-PT"OHFMFT My

    memorial RuboCop’s issue 2018

  6.  5IV Magic comment magic ,PJDIJ*50&4. JOD )FJTFJSC 4IJCVZB +BQBO

    My memorial RuboCop’s issue 2018 Reiwa edition

  7. !LPJD w *DPNFGSPN5PLZP +BQBO w *`NXPSLJOHJO&4. JOD w 3VCP$PQDPNNJUUFS w

    "30SBDMFFOIBODFE BEBQUFSDPNNJUUFS w 3VCZ,BJHJTQFBLFS w 3VCZ,BJHJ-5FS

  8. "TJNJMBSOPUBUJPOT Ӭ࿨ &JXB4ZTUFN.BOBHFNFOU *OD ྩ࿨ 3FJXB

  9. "TJNJMBSOPUBUJPOT Ӭ࿨ &JXB4ZTUFN.BOBHFNFOU *OD /eiwa/i.match?('Eiwa') #=> true ྩ࿨ 3FJXB

  10. "TJNJMBSOPUBUJPOT Ӭ࿨ &JXB4ZTUFN.BOBHFNFOU *OD /eiwa/i.match?('Eiwa') #=> true ྩ࿨ 3FJXB /eiwa/i.match?('Reiwa')

    #=> true

  11. *DPNFGSPNFJXB

  12. 044

  13. Support coexistence with OSS community

  14. None

  15. 5IJTJTUIF3VCP$PQDPOUSJCVUPSTSBOLJOHUIJTZFBS

  16. 5IJTJTUIF3VCP$PQDPOUSJCVUPSTSBOLJOHUIJTZFBS *U`TNF

  17. *XJMMUBMLBCPVU lNBHJDDPNNFOUz XJUI3VCP$PQ UIJTQSFTFOUBUJPO

  18. 3VCZIBTUXPNBKPS NBHJDDPNNFOUGFBUVSFT

  19. 3VCZIBTUXPNBKPS NBHJDDPNNFOUGFBUVSFT w&ODPEJOHNBHJD DPNNFOU

  20. 3VCZIBTUXPNBKPS NBHJDDPNNFOUGFBUVSFT w&ODPEJOHNBHJD DPNNFOU w'SP[FOTUSJOHMJUFSBM NBHJDDPNNFOU

  21. &ODPEJOHNBHJDDPNNFOU # encoding: 'utf-8' # encoding: 'ascii'

  22. &ODPEJOHNBHJDDPNNFOU w5IJTNBHJDDPNNFOUNBLFTpMF FODPEJOHTQFDJpFECZFODPEJOH w*OUSPEVDFEGSPN3VCZ w4DSJQUFODPEJOHJT65'CZ EFGBVMUGSPN3VCZ w5IVTUIJTNBHJDDPNNFOUJT VOOFFEFEBMNPTUDBTFTDVSSFOUMZ

  23. # frozen_string_literal: true # frozen_string_literal: false 'SP[FOTUSJOHNBHJDDPNNFOU

  24. 'SP[FOTUSJOHNBHJDDPNNFOU w5IJTNBHJDDPNNFOUNBLFTGSP[FO TUSJOHMJUFSBMXIFUIFSPSOPU w*OUSPEVDFEGSPN3VCZ w3VCZPO3BJMTGSBNFXPSLDPEFT JOUSPEVDFEJUGSPN3BJMT w0OUIFPUIFSIBOE3BJMT HFOFSBUPSTEPFTOPUJODMVEFEJU

  25. 5IFSFJTBDPQ SFMBUFEUPUIFTF NBHJDDPNNFOUT

  26. SVCPDPQIRSVCPDPQ 'FBUVSF3FRVFTU8BSOJOWBMJEMPDBUJPOPG DPEJOHQSBHNB

  27. 5IJTJTBGFBUVSFSFRVFTUUP3VCP$PQ

  28. SVCPDPQIRSVCPDPQ <'JY>"EEOFXA-JOU0SEFSFE.BHJD$PNNFOUTADPQ

  29. 5IJTQVMMSFRVFTUIBTJNQMFNFOUFEUIFGFBUVSF

  30. "CPVUGFBUVSF w5IJTDPQDIFDLTDPEJOH NBHJDDPNNFOUTIPVMECF pSTUMJOF PSOFYUPGTIFCBOH
 
 
 


  31. "CPVUGFBUVSF w5IJTDPQDIFDLTDPEJOH NBHJDDPNNFOUTIPVMECF pSTUMJOF PSOFYUPGTIFCBOH w5IFOFYUTMJEFFYBNQMF FYQFDUFEUPGSP[FOTUSJOH BOE65'FODPEJOH

  32. #BEPSEFS # frozen_string_literal: true # encoding: ascii p [''.frozen?, ''.encoding]

    #=> [true, #<Encoding:UTF-8>] *UFYQFDUFE"4$**FODPEJOHCVUBDUVBMMZ65'FODPEJOH

  33. (PPEPSEFS # encoding: ascii # frozen_string_literal: true p [''.frozen?, ''.encoding]

    #=> [true, #<Encoding:US-ASCII>]

  34. (PPEPSEFS #!/usr/bin/env ruby # encoding: ascii # frozen_string_literal: true p

    [''.frozen?, ''.encoding] #=> [true, #<Encoding:US-ASCII>]

  35. 1SFWJPVTMZ  UIJTDPQIBE BQSPCMFN

  36. SVCPDPQIRSVCPDPQ -JOU0SEFSFE.BHJD$PNNFOUTSFQPSUTBUMJOFJTOPU BNBHJDDPNNFOU

  37. *UXBTBCVHSFQPSUGSPNNZ3VCZGSJFOE

  38. 5IJTJTBWBMJEDPEF # frozen_string_literal: true x = { encoding: Encoding::SJIS }

    puts x

  39. "OPGGFOTFPG 3VCP$PQPDDVST # frozen_string_literal: true x = { encoding: Encoding::SJIS

    } puts x test.rb:3:1: W: Lint/ OrderedMagicComments: The encoding magic comment should precede all other magic comments.

  40. SVCPDPQIRSVCPDPQ <'JY>'JYBGBMTFQPTJUJWFGPS A-JOU0SEFSFE.BHJD$PNNFOUTA

  41. *PQFOFEBQVMMSFRVFTUUPpYJU

  42. 5IJTJTUIFDPSFPGUIF QBUDI

  43. 5IFSFXBTBGBMTFQPTJUJWF UPNJTVOEFSTUBOEJOHUIF )BTIOPUBUJPOBTBO FODPEJOHNBHJDDPNNFOU

  44. "TJNJMBSOPUBUJPOT

  45. "TJNJMBSOPUBUJPOT .BHJDDPNNFOU # encoding: ascii

  46. "TJNJMBSOPUBUJPOT .BHJDDPNNFOU # encoding: ascii )BTI x = { encoding:

    Encoding::SJIS }

  47. "TJNJMBSOPUBUJPOT .BHJDDPNNFOU # encoding: ascii )BTI x = { encoding:

    Encoding::SJIS } ^^^^^^^^^^^^^^^^^^^^^^^^

  48. "TJNJMBSOPUBUJPOT .BHJDDPNNFOU # encoding: ascii ^^^^^^^^^^^^^^^ )BTI x = {

    encoding: Encoding::SJIS } ^^^^^^^^^^^^^^^^^^^^^^^^

  49. "TJNJMBSOPUBUJPOT # encoding: ascii ^^^^^^^^^^^^^^^ encoding: Encoding::SJIS ^^^^^^^^^^^^^^^^^^^^^^^^

  50. "TJNJMBSOPUBUJPOT encoding: ascii ^^^^^^^^^^^^^^^ encoding: Encoding::SJIS ^^^^^^^^^^^^^^^^^^^^^^^^

  51. )PXEPZPVMPPLTUIJT encoding: ascii ^^^^^^^^^^^^^^^ encoding: Encoding::SJIS ^^^^^^^^^^^^^^^^^^^^^^^^

  52. 5IJTQBUDIDIBOHFTUIF QBUUFSONBUDIPGUIF FODPEJOHNBHJDDPNNFOU UIBUCFHJOOJOHPGMJOF BMXBZTTUBSUTXJUIAA

  53. 5IFNBHJDDPNNFOUMJOF BMXBZTTUBSUTXJUIAA encoding: ascii ^^^^^^^^^^^^^^^ encoding: Encoding::SJIS ^^^^^^^^^^^^^^^^^^^^^^^^

  54. 5IFNBHJDDPNNFOUMJOF BMXBZTTUBSUTXJUIAA # encoding: ascii ^^^^^^^^^^^^^^^^^ encoding: Encoding::SJIS ^^^^^^^^^^^^^^^^^^^^^^^^

  55. 5IJTXBTBGVOOZCVH

  56. 4P ZPVDBOPQFO BOJTTVFPSB13 BMXBZT JGZPVpOEBCVHPS BOJTTVF

  57. :PVSJTTVFNBZCF BOZPOFTJTTVF

  58. 4FFZPVTPDJBMDPEJOH DPNNVOJUZXPSME XJUI3VCZ

  59. l /PXBZUPMJNJUPVS HPBMT8FMMpOEB SFBTPOUPCFMJFWF 'BDJOH/PWB&SB /PWB&SB