Polishing on "Polished Ruby Programming" #kaigionrails / kaigionrails 2021

Recorded Video: https://youtu.be/EJuKeX7k2rY

Ruby is Nice so We are Nice
https://speakerdeck.com/kakutani/ruby-is-nice-so-we-are-nice
https://youtu.be/NctyqVznddg, https://youtu.be/P7AunfXSOTQ

Polished Ruby Programming
https://www.packtpub.com/product/polished-ruby-programming/9781801072724

Jeremy Evans
https://github.com/jeremyevans
https://twitter.com/jeremyevans0

Lambda Note
https://www.lambdanote.com

n月刊ラムダノート 既刊5冊セット（電子書籍のみ） – 技術書出版と販売のラムダノート https://www.lambdanote.com/collections/frontpage/products/nmonthly-5set-2021-ebook

RubyでつくるRuby ゼロから学びなおすプログラミング言語入門（PDF版のみ） – 技術書出版と販売のラムダノート https://www.lambdanote.com/collections/frontpage/products/ruby-ruby-ebook

エクストリームプログラミング【委託】 - 達人出版会
https://tatsu-zine.com/books/extreme-programming

僕らはエクストリームプログラミングのかけら
https://speakerdeck.com/kakutani/xpmatsuri2019-keynote

Optimizing Partial Backtraces in Ruby 3 by Jeremy Evans - RubyKaigi Takeout 2021
https://rubykaigi.org/2021-takeout/presentations/jeremyevans0.html

Polished Ruby Programming (Amazon.com)
https://www.amazon.com/dp/1801072728

Polished Ruby Programming (Amazon.co.jp)
https://www.amazon.co.jp/dp/B093TH9P7C

Ruby Archaeology by Nick Schwaderer - RubyKaigi Takeout 2021
https://rubykaigi.org/2021-takeout/presentations/schwad4hd14.html
Ruby Archaeology
https://schwaderer-kaigi-2021.herokuapp.com/#33

前提知識が多い。すごくおおい → 最後にまとめて掲載

Rubyist Magazine 0028 号 巻頭言
https://magazine.rubyist.net/articles/0028/0028-ForeWord.html

ﾜﾀｼﾊ ﾙﾋﾞｰｶｲｷﾞ ﾁｮｯﾄﾃﾞｷﾙ / I can organize RubyKaigi a little
https://speakerdeck.com/kakutani/i-can-organize-rubykaigi-a-little

マッドマックス　怒りのデス・ロード (2015) - IMDb
https://www.imdb.com/title/tt1392190/

日本Rubyの会とは | 一般社団法人 日本Rubyの会
https://ruby-no-kai.org/

RubyKaigi Takeout 2021
https://rubykaigi.org/2021-takeout

RubyConf 2021
https://rubyconf.org/

Rubyにとって決定的に足りないものは何だと思いますか？
https://qr.ae/pGVdZc

状況に埋め込まれた学習―正統的周辺参加 Jean Lave, Etienne Wenger
https://www.amazon.co.jp/dp/4782800843

Kaigi on Rails 2021
https://kaigionrails.org/2021/

FJORD BOOT CAMP（フィヨルドブートキャンプ）
https://bootcamp.fjord.jp/

Ginza Rails27 igaiga - Speaker Deck
https://speakerdeck.com/igaiga/ginza-rails27-igaiga?slide=9

Jeremy Evans on Twitter: "Weighing in at 434 pages, "Polished Ruby Programming" will be available for sale on July 9. Currently, it is the #1 New Release in Ruby Computer Programming! This would probably be more impressive if there was more than one new release. :) https://t.co/wFRn4yHbVC @PacktPub" / Twitter
https://twitter.com/jeremyevans0/status/1407513414646198279

Junya Ogura on Twitter: "池袋のジュンク堂、ついにPythonコーナーが独立した。 https://t.co/nAgaXMnBEz" / Twitter
https://twitter.com/junya/status/1437704432372781060

Amazon.co.jp: 角谷 信太郎:作品一覧、著者略歴 https://www.amazon.co.jp/%E8%A7%92%E8%B0%B7%E4%BF%A1%E5%A4%AA%E9%83%8E/e/B0051LA12K

Kakutani Shintaro on Twitter: "売れる本を書けば本は売れる(迫真" / Twitter https://twitter.com/kakutani/status/1382919795939549184

前提知識がおおい。すごくおおい:

WEB+DB PRESS総集編［Vol.1～120］
https://gihyo.jp/book/2021/978-4-297-12215-7

メタプログラミングRuby 第2版
https://www.oreilly.co.jp/books/9784873117430/

オブジェクト指向設計実践ガイド　～Rubyでわかる 進化しつづける柔軟なアプリケーションの育て方
https://gihyo.jp/book/2016/978-4-7741-8361-9

リファクタリング　既存のコードを安全に改善する（第2版）
https://tatsu-zine.com/books/refactoring-2ed

テスト駆動開発
https://tatsu-zine.com/books/test-driven-development

実践テスト駆動開発 テストに導かれてオブジェクト指向ソフトウェアを育てる
https://www.shoeisha.co.jp/book/detail/9784798124582

Rubyのしくみ　Ruby Under a Microscope
https://tatsu-zine.com/books/ruby-under-a-microscope-ja

Clean Architecture 達人に学ぶソフトウェアの構造と設計
https://tatsu-zine.com/books/clean-architecture

リーダブルコード
https://www.oreilly.co.jp/books/9784873115658/

Rubyソースコード完全解説(全文)
https://i.loveruby.net/ja/rhg/book/

Java言語で学ぶデザインパターン入門 第3版
https://www.hyuki.com/dp/

Specification by Example
https://www.manning.com/books/specification-by-example

The RSpec Book
https://www.shoeisha.co.jp/book/detail/9784798121932

The Well-Grounded Rubyist, Third Edition,
https://www.manning.com/books/the-well-grounded-rubyist-third-edition

Exceptional Ruby: Master the Art of Handling Failure in Ruby
https://pragprog.com/titles/ager/exceptional-ruby/

Ruby Performance Optimization: Why Ruby Is Slow, and How to Fix It https://pragprog.com/titles/adrpo/ruby-performance-optimization/

Rubyによるデザインパターン
https://www.amazon.co.jp/dp/4894712857

明解!Ruby―奥深いRubyの文化を身に付けるテクニック
https://www.amazon.co.jp/dp/4864011095

ドメイン特化言語 パターンで学ぶDSLのベストプラクティス46項目
https://www.amazon.co.jp/dp/4864010471

Transcript

1. !LBLVUBOJ 
 0DU
   
   LBJHJPOSBJMT
    POLISHING ON POLISHED RUBY 
 PROGRAMMING
2. ֯୩
   ৴ଠ࿠ @kakutani 
 Rubyist-ist, Keeb zombie⌨🧟 Ұࣾ ೔ຊ3VCZͷձཧࣄ
   ג Ӭ࿨γεςϜϚωδϝϯτސ໰ 
 ϑΟϤϧυϒʔτΩϟϯϓސ໰
   ϝΧχΧϧΩʔϘʔυεΠον५׈ऀ
3. 3VCZJTUJTU
   ͱ͸
4. https://speakerdeck.com/kakutani/ruby-is-nice-so-we-are-nice 📺
   IUUQTZPVUVCF/DUZR7[OEEH
   📺
   IUUQTZPVUVCF1"VOG94052
5. https://www.packtpub.com/product/polished-ruby-programming/9781801072724 ݪஶͷిࢠॻ੶͸,JOEMFͰ΋ങ͑Δ͚Ͳɺ1BDLUͷ௚ൢͰങ͏ͱ %3.'SFFͷ1%'౳ΛೖखͰ͖Δ͔Β௚ൢ͕͓͢͢Ίͩκ😆📚 
6. +FSFNZ͸
   3VCZ
   $PNNJUUFS
   Ͱɺ3VCZ,BJHJ
   
   ͷ,FZOPUF
   4QFBLFSͰ͋ΓɺCVHTSVCZMBOHPSH
   ͷνέο τΛ௚͠·ͬͯ͘
   3VCZ1SJ[F
   
   Λड৆͍ͯ͠ΔΑɻ$PNNJUUFSͱͯ͠͸৽͠Ίͷ3VCZJTU͚ͩͲɺ3VCZ,BJHJ ʹॳΊͯొஃͨ͠ͷ͸3VCZ,BJHJ
   ͱ͍͏ݹࢀͳͷͩɻ4FRVFM΍3PEBͳͲΛ΋Γ΋Γϝϯςφϯε͍ͯ͠ΔΑ
7. Lambda Note
8. ʰݚᮎ3VCZϓϩάϥϛϯάʱ Ծ 
 ࢮܐࣥߦத
   ຋༁ਐߦத
   ೥ཅय़ ༧ఆ
   ֯୩৴ଠ࿠༁
   ϥϜμϊʔτࣾץο
   ೥݄
   ిॻЌ൛
   ൢച։࢝ر๬ ر๬ 
 ϖʔδ<্࢙࠷ް>͋ΔͷͰ࣌ؒΛ͍ͩ͘͞ʜ
9. https://www.lambdanote.com/collections/frontpage/products/ruby-ruby-ebook
10. ⁋ຊ͞ΜͷʮύλʔϯϚον
    JO
    3VCZʯ ݱঢ়ͱ͸গ͠࢓༷͸มΘ͍ͬͯΔ͚Ͳlͳͥz͕ॻ͔Ε͍ͯΔ͔ΒλΠϜϨε ͩ ΍ɺ֏͞ΜͷʮE3VCZͰָ͠Ή෼ࢄΦϒδΣΫτʯɺNBNFUUFSͷʮʰίϧʔνϯʱͱ͸Կͩͬͨͷ͔ʁʯʮʰܧ ଓʱͷͻΈͭʯͱ͍ͬͨ3VCZJTUͷدߘ΍ͳΜ͔೉͠Ίιϑτ΢ΣΞ͕ΒΈͷ࿩͕ͨ͘͞ΜಡΊ͓ͯಘR https://www.lambdanote.com/collections/frontpage/products/nmonthly-5set-2021-ebook
11. ങͬͯ͘ ΕR
12. ໨త
13. lզʑ͸ɺιϑτ΢ΣΞ։ൃʹ͓͍ͯ৽ͨͳࣾձߏ଄ Λ࡞Γग़͠ɺͦͷͳ͔ で ٕज़తͳߴΈͱ ビジ ωεͷ ビ ジ ϣϯΛ݁ び ෇͚ɺಠࣗͷ バ ϦϡʔΛ࣋ͬͨ プ ϩ ダ Ϋ τ΍αʔ ビ εΛੜΈग़͢ػձΛ͍࣋ͬͯΔɻ 
 ͜Ε が զʑͷڧΈ だ ɻ
    ɹ91ͷ੒ޭ͸ɺ৴པ で ͖Διϑτ΢ΣΞͷ͢ ば ΍͍ ݟੵΓɺ࣮૷ɺ デプ ϩΠ がで ͖Δ༏लͳ プ ϩ グ ϥϚʔ ͷ૿Ճʹ͔͔͍ͬͯΔɻ ڧௐ౳͸Ҿ༻ऀʹΑΔ
14. https://speakerdeck.com/kakutani/xpmatsuri2019-keynote ͜Ε͸ߨԋͷͱ͖ͷഎܠը૾͔͠࢒ͬͯͳͯ͘͝ΊΜ΍Ͱʜ
15. https://www.packtpub.com/product/polished-ruby-programming/9781801072724
16. “This book is aimed at intermediate Ruby programmers and focuses on teaching principles of Ruby programming, as well as trade-offs to consider when making implementation decisions. !"#$%&'()*+,-./0123456)*+,-./078/(9:;%< =>?@ABCD(EF2GHIAJKLM;3NOAPQ6QRCS — Jeremy Evans (RubyKaigi Takeout 2021)
17. Polished Ruby Programming #ŪŰ w ίϛϡχςΟͷlेશత࣮ફऀzʹΑΔٱͼ͞ͷେܕॻ੶
    w ෦ߏ੒
    શষ
    3VCZ
    ରԠ
    w ୈ෦
    3VCZͷlجૅz ϝιουҾ਺ʹҟ༷ʹ͘Θ͍͠
    w ୈ෦
    ࣮ફͷlݪଇͱτϨʔυΦϑz
    w ୈ෦
    +FSFNZͷओு
    P ff
    UIF
    3BJMT %# 8FC ηΩϡϦςΟ
    w ϖʔδ จষͱίʔυ͔͠ͳ͍ ͔ͨ͘ͳʹਤ͕ແ͍
    w l8PSL
    $PSSFDU
    'VO
    ʜBOE
    'BTUz
    w αϯϓϧίʔυ͕པ΋͍͠ པ΋͗͢͠Δ͔΋😂
18. album_artists = {} album_track_artists = {} album_infos.each do |album, track, artist| (album_artists[album] ||= []) << artist (album_track_artists[[album, track]] ||= []) << artist end album_artists.each_value(&:uniq!) པ΋͍͠αϯϓϧίʔυͷ͘͝؆୯ͳྫ )BTIͷΤϯτϦʹ഑ྻΛ֨ೲ͢ΔࡍʹɺΤϯτϦ͕OJMͷ৔߹͸ۭ഑ྻͰॳظԽ͔ͯ͠ΒཁૉΛ௥Ճ ͢Δͷ͸ߦͰॻ͚ͯ΂ΜΓɺͱ͍͏͜ͱʹ͍ͭͯಛʹຊจͰઆ໌ෆཁͳͷ͕ର৅ಡऀͷதڃऀͩΑ 
 ଞʹ΋ɺsuper ͷ࢖͍ํ͕΍ͨΒͱ্खͳͷ͕ҹ৅ʹ࢒Γ·ͨ͠ɻࢀߟʹͳΔ😵💫
19. 3VCZ্ڃऀͷϨϏϡʔ  ʮ͍͍ͩͨ஌ͬͯͨʯ Ͱ͠ΐ͏Ͷ https://www.amazon.com/dp/1801072728
20. 3VCZ্ڃऀͷϨϏϡʔ  ͜Ε͸੢ౢ͞ΜͰ͸ʁ
    lॳֶऀͷਓ͸ؾܰʹ࣭໰Ͱ͖Δ্ڃऀΛ୳ͨ͠΄͏͕͍͍Αz ΍͍͞͠ https://www.amazon.com/dp/1801072728
21. 3VCZ্ڃऀͷϨϏϡʔ  https://www.amazon.co.jp/dp/B093TH9P7C ʮ͜ͷͻͱΊͬͪΌ3VCZίϛϡχ ςΟʹ͘Θ͍͠ͳʯͱࢥͬͨΒɺ 
 ϑΝχʔτͰͨ͠
22. Polished Ruby Programming #?? w ίʔσΟϯάελΠϧ͕ŧŔŕŪŝŬūſʜ
    w checkϝιουͩ
    ௚આ๏Ͱͳ໋͘ྩ๏ʜͬͯŠŪ
    w do…end͔ΒͷϝιουνΣΠϯ͕ؾʹͳͬͪΌ͏ 
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    w 3VCZରԠʜແŰƅŦŖƃŵŕŧ ແ3BDUPS ແ3F fi OFNFOUT
    w લఏ஌͕͓͓͍ࣝɻ͓͓͍͘͢͝
23. “The Weirich Convention” https://schwaderer-kaigi-2021.herokuapp.com/#33 ͘Θ͘͠͸3VCZ,BJHJ
    5BLFPVU
    ͷ
    !TIXBE
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    do…end ͸खଓ͖తϒϩοΫʹ࢖͏ͱ໌ࣔతʹݴͬͨͷ͸"WEJͳͷ͔ͳ
24. લఏ஌͕͓͓͍ࣝɻ͓͓͍͘͢͝ɻ
25. ૊ΈࠐΈΫϥε
    ม਺
    ϝιουҾ ਺
    ྫ֎ॲཧ
    ಠࣗΫϥεઃܭ
    3VCP$PQ
    Ϟδϡʔϧ
    ϝλϓϩ άϥϛϯά
    %4-
    ςετ
    ΠσΟ ΦϚςΟοΫ3VCZ
    ϦϑΝΫλϦ ϯά
    σβΠϯύλʔϯ
    ࠷దԽʜ
26. ༁ॻઈ൛ ༁͕ඍົ ະ༁ॻ੶ ݹ͍
    େ෦ͳͷ΋ڍ͛ͯ·͢ ৭͕ബ͍΍ͭ 
 8&# %#
    13&44͸LPͷ࿈ࡌl3VCZͷ΢ϥΨϫz͕ඞಡd 
 ૯ूฤʹશ෦͸ऩ࿥͞Εͯͳ͍ͷͰԿ߸͔ݸผͰങ͏ 
 ʰ3VCZιʔείʔυ׬શղઆʱ 3)( ͸΢ΣϒͰશจಡΊ·͢
27. ʰݚᮎ3VCZϓϩάϥϛϯάʱ Ծ 
 ࢮܐࣥߦத
    ຋༁ਐߦத
    ೥ཅय़ ༧ఆ
    ֯୩৴ଠ࿠༁
    ϥϜμϊʔτࣾץο
    ೥݄
    ిॻЌ൛
    ൢച։࢝ر๬ ر๬ 
 ϖʔδ<্࢙࠷ް>͋ΔͷͰ࣌ؒΛ͍ͩ͘͞ʜ
28. lզʑ͸ɺιϑτ΢ΣΞ։ൃʹ͓͍ͯ৽ͨͳࣾձߏ଄ Λ࡞Γग़͠ɺͦͷͳ͔ で ٕज़తͳߴΈͱ ビジ ωεͷ ビ ジ ϣϯΛ݁ び ෇͚ɺಠࣗͷ バ ϦϡʔΛ࣋ͬͨ プ ϩ ダ Ϋ τ΍αʔ ビ εΛੜΈग़͢ػձΛ͍࣋ͬͯΔɻ 
 ͜Ε が զʑͷڧΈ だ ɻ
    ɹ91ͷ੒ޭ͸ɺ৴པ で ͖Διϑτ΢ΣΞͷ͢ ば ΍͍ ݟੵΓɺ࣮૷ɺ デプ ϩΠ がで ͖Δ༏लͳ プ ϩ グ ϥϚʔ ͷ૿Ճʹ͔͔͍ͬͯΔɻ ڧௐ౳͸Ҿ༻ऀʹΑΔ
29. 3VCZίϛϡχςΟଘଓͷ՝୊ w 
    3VCZΤίγεςϜͷൃల
    w 
    3VCZίϛϡχςΟͷ৽௠୅ँ
    w 
    3VCZίϛϡχςΟ಺Ͱͷ࿅౓ͷ޲্
    w 
    ࠃ಺Ͱͷ 3VCZϓϨθϯεͷҡ࣋
30. 3VCZίϛϡχςΟ
    ͱ͸
31. http://www. fl ickr.com/photos/recompile_net/4932459606/ lίϛϡχςΟͱ͸୭͔ɻ΋ͪΖΜɺ ͋ͳͨͷ͜ͱͩɻ͋ͳ͕ͨίϛϡχ ςΟͰ͋Γɺ
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    3VCZJTU
    .BHB[JOF
    ߸ר಄ݴ
32. ƂŦŢŰ ſűƄŖŜŘŝƄ ŧŔŕŪũƄŝſ / I can organize RubyKaigi a little https://speakerdeck.com/kakutani/i-can-organize-rubykaigi-a-little 3VCZίϛϡχςΟ͸࿭੕ʹͻͱͭ ஍ٿ্ʹແ਺ʹଘࡏ͢Δࠃ΍஍Ҭɺൃ࿩͢Δࣗવݴޠɺڵຯɾؔ৺ʹΑΔαϒίϛϡχςΟͦΕͧΕ͕ॏͳΓͱͭͳ͕ΓΛ࣋ ͭ͜ͱͰ3VCZʹ·ͭΘΔଟ૚తͳ࣮ફڞಉମΛ஍ٿ্ʹߏ੒͢Δͷͩɻଟ༷Ͱ͋ͬͯ΋෼அ͸͞Εͯ΄͘͠ͳ͍Αɻ3VCZ࠾ ༻اۀͷ৬৔ʹ΋3VCZͷ࣮ફڞಉମͱͯ͠ͷଆ໘͕͋ΔΑɻ෼அ͞Ε͍ͯͳ͍ͱߟ͑ͯΈͯ͸Ͳ͏ͩΖ͏͔ʁ
33. 3VCZίϛϡχςΟଘଓͷ՝୊ w 
    3VCZΤίγεςϜͷൃల
    w 
    3VCZίϛϡχςΟͷ৽௠୅ँ
    w 
    3VCZίϛϡχςΟ಺Ͱͷ࿅౓ͷ޲্
    w 
    ࠃ಺Ͱͷ 3VCZϓϨθϯεͷҡ࣋
34. 3VCZJTU͕޾ͤʹ฻ΒͤΔɺ ΦʔηϯςΟοΫͰ͍ΒΕΔ 
 ΤϯδχΞϦϯά૊৫ΛٻΊͯʜ
36. 
    3VCZΤίγεςϜͷൃల
37. 3VCZΤίγεςϜͷൃల w 
    ίʔυΛॻ͘
    w 
    ӳޠ BT
    B
    MJOHVB
    GSBODB Ͱडൃ৴͢Δ
    w 
    ࠃࡍΧϯϑΝϨϯεͰࣗ෼ͷଘࡏΛࣔ͢ ͜͜Ͱ͸ʮ޲৺తํ޲ʹҠಈ͢ΔʯԦಓίʔεΛࣔͨ͢Ίʹɺएׯޠฐͷ͋Δ୯७ԽΛ͍ͯ͠ΔΑɻ΋ͪΖΜίϯτ ϦϏϡʔγϣϯͷ͔ͨͪ͸͞·͟·Ͱ͋Γɺ3VCZͷ࣮ફڞಉମʹlࢀՃ͢Δz 3VCZJTUʹͳΔ ಓ͸ͻͱͭͰ͸ͳ͍Α
41. 3VCZίϛϡχςΟͷ৽௠୅ँ
42. 2VPSB
    TIZPVIFJ
    3VCZ
    ଍Γͳ͍
    <ݕࡧ>
43. lਖ਼౷తपลࢀՃ͸ԁख़࣮ͨ͠ફͷ৔ʹ͓͚ΔͦͷҐ ஔʹΑͬͯಈػ͚ͮΒΕͯ޲৺తํ޲ʹҠಈ͢Δɻͦ Ε͸૿େ͍ͯ͘͠ࢀՃͷ࢖༻Ձ஋ʹΑͬͯɺ͞Βʹɺ ৽ࢀऀͷेશత࣮ફऀʹͳΓ͍ͨͱ͍͏ཉٻʹΑͬ ͯɺಈػ͚ͮΒΕΔɻ࣮ફڞಉମʹ͸ྺ࢙ͱൃୡͷα ΠΫϧ͕͋ΓɺͦΕࣗମ͸ɺ৽ࢀऀ͕ݹࢀऀʹస਎͢ Δ͜ͱ͕໨ཱͨͳ͍ܗͰ࣮ફʹͱͬͯඞਢͱͳΔ΍Γ ํͰ࠶ੜ࢈͞ΕΔɻ
46. https://speakerdeck.com/igaiga/ginza-rails27-igaiga?slide=9 !JHBJHB
    ͕ۜ࠲3BJMT
    Ͱ࿩ͨ͠ͱ͖ͷओʹॳֶऀ޲͚ͷॻ੶Ϛοϓ͕΂ΜΓ
47. 3VCZίϛϡχςΟ಺Ͱͷ
    ɹ
    ࿅౓ͷ޲্
48. lਖ਼౷తपลࢀՃ͸ԁख़࣮ͨ͠ફͷ৔ʹ͓͚ΔͦͷҐ ஔʹΑͬͯಈػ͚ͮΒΕͯ޲৺తํ޲ʹҠಈ͢Δɻͦ Ε͸૿େ͍ͯ͘͠ࢀՃͷ࢖༻Ձ஋ʹΑͬͯɺ͞Βʹɺ ৽ࢀऀͷेશత࣮ફऀʹͳΓ͍ͨͱ͍͏ཉٻʹΑͬ ͯɺಈػ͚ͮΒΕΔɻ࣮ફڞಉମʹ͸ྺ࢙ͱൃୡͷα ΠΫϧ͕͋ΓɺͦΕࣗମ͸ɺ৽ࢀऀ͕ݹࢀऀʹస਎͢ Δ͜ͱ͕໨ཱͨͳ͍ܗͰ࣮ફʹͱͬͯඞਢͱͳΔ΍Γ ํͰ࠶ੜ࢈͞ΕΔɻ
49. https://www.packtpub.com/product/polished-ruby-programming/9781801072724
50. “This book is aimed at intermediate Ruby programmers and focuses on teaching principles of Ruby programming, as well as trade-offs to consider when making implementation decisions. !"#$%&'()*+,-./0123456)*+,-./078/(9:;%< =>?@ABCD(EF2GHIAJKLM;3NOAPQ6QRCS — Jeremy Evans (RubyKaigi Takeout 2021)
51. Polished Ruby Programming #ŪŰ w ίϛϡχςΟͷlेશత࣮ફऀzʹΑΔٱͼ͞ͷେܕॻ੶
    w ෦ߏ੒
    શষ
    3VCZ
    ରԠ
    w ୈ෦
    3VCZͷlجૅz ϝιουҾ਺ʹҟ༷ʹ͘Θ͍͠
    w ୈ෦
    ࣮ફͷlݪଇͱτϨʔυΦϑz
    w ୈ෦
    +FSFNZͷओு
    P ff
    UIF
    3BJMT %# 8FC ηΩϡϦςΟ
    w ϖʔδ จষͱίʔυ͔͠ͳ͍ ͔ͨ͘ͳʹਤ͕ແ͍
    w l8PSL
    $PSSFDU
    'VO
    ʜBOE
    'BTUz
    w αϯϓϧίʔυ͕པ΋͍͠ པ΋͗͢͠Δ͔΋😂
52. ༁ॻઈ൛ ༁͕ඍົ ະ༁ॻ੶ ݹ͍
    େ෦ͳͷ΋ڍ͛ͯ·͢ ৭͕ബ͍΍ͭ 
 8&# %#
    13&44͸LPͷ࿈ࡌl3VCZͷ΢ϥΨϫz͕ඞಡd 
 ૯ूฤʹશ෦͸ऩ࿥͞Εͯͳ͍ͷͰԿ߸͔ݸผͰങ͏ 
 ʰ3VCZιʔείʔυ׬શղઆʱ 3)( ͸΢ΣϒͰશจಡΊ·͢
53. lզʑ͸ɺιϑτ΢ΣΞ։ൃʹ͓͍ͯ৽ͨͳࣾձߏ଄ Λ࡞Γग़͠ɺͦͷͳ͔ で ٕज़తͳߴΈͱ ビジ ωεͷ ビ ジ ϣϯΛ݁ び ෇͚ɺಠࣗͷ バ ϦϡʔΛ࣋ͬͨ プ ϩ ダ Ϋ τ΍αʔ ビ εΛੜΈग़͢ػձΛ͍࣋ͬͯΔɻ 
 ͜Ε が զʑͷڧΈ だ ɻ
    ɹ91ͷ੒ޭ͸ɺ৴པ で ͖Διϑτ΢ΣΞͷ͢ ば ΍͍ ݟੵΓɺ࣮૷ɺ デプ ϩΠ がで ͖Δ༏लͳ プ ϩ グ ϥϚʔ ͷ૿Ճʹ͔͔͍ͬͯΔɻ ڧௐ౳͸Ҿ༻ऀʹΑΔ
54.  ࠃ಺Ͱͷ 
 ɹ
    3VCZϓϨθϯεͷҡ࣋
55. 3VCZJTU͕޾ͤʹ฻ΒͤΔɺ ΦʔηϯςΟοΫͰ͍ΒΕΔ 
 ΤϯδχΞϦϯά૊৫ΛٻΊͯʜ
57. https://twitter.com/jeremyevans0/status/1407513414646198279 l "NB[PO ͷ3VCZίϯϐϡʔλॻ৽ץϥϯΩϯάͰҐʹͳͬͨΑ 
 3VCZͷ৽ץ͕࡭Ҏ্͋ͬͨΒ΋ͬͱྑ͔ͬͨΜ͚ͩͲ
     z
58. https://twitter.com/junya/status/1437704432372781060
59. Ͱ΋΍ΔΜͩΑR w ຊ͕ॻళʹ͋Δ
    
    ੜ͖ͯ·͢Ξϐʔϧ
    w ࠃ಺ͩͱ೔ຊޠ͡Όͳ͍ͱϦʔν͠ͳ͍
    w ίϩφՒͰిॻؚΊ ٕज़ॻࢢ৔͸ଟগ࣋ͪ௚͠ ͍ͯΔ Β͍͕͠ಈըੈ୅ͷᎱ಄͕ʜ
    w 3VCZͷຊ͸ͦΜͳʹ਺͕ग़ͳ͍
    w ϋΠΤϯυٕज़ॻ͸ͦΜͳʹ਺͕ग़ͳ͍
    w ຊॻ͸
    3VCZ
    Y
    ϋΠΤϯυٕज़ॻ
    😇
60. 3VCZ
    Y
    ϋΠΤϯυٕज़ॻ
    😇
61. ࡞ઓ
62. https://twitter.com/kakutani/status/1382919795939549184
63. ചΕΔຊΛॻ͚͹ຊ͸ചΕΔ ഭਅ
64. 3VCZ
    Y
    ϋΠΤϯυٕज़ॻ
    😇
65. 🥺
66. ·ͱΊ
67. ʰݚᮎ3VCZϓϩάϥϛϯάʱ Ծ 
 ࢮܐࣥߦத
    ຋༁ਐߦத
    ೥ཅय़ ༧ఆ
    ֯୩৴ଠ࿠༁
    ϥϜμϊʔτࣾץο
    ೥݄
    ిॻЌ൛
    ൢച։࢝ر๬ ر๬ 
 ϖʔδ͋Δ<্࢙࠷ް>ͷͰ࣌ؒΛ͍ͩ͘͞ʜ
68. ങͬͯ͘ ΕR
69. lզʑ͸ɺιϑτ΢ΣΞ։ൃʹ͓͍ͯ৽ͨͳࣾձߏ଄ Λ࡞Γग़͠ɺͦͷͳ͔ で ٕज़తͳߴΈͱ ビジ ωεͷ ビ ジ ϣϯΛ݁ び ෇͚ɺಠࣗͷ バ ϦϡʔΛ࣋ͬͨ プ ϩ ダ Ϋ τ΍αʔ ビ εΛੜΈग़͢ػձΛ͍࣋ͬͯΔɻ 
 ͜Ε が զʑͷڧΈ だ ɻ
    ɹ91ͷ੒ޭ͸ɺ৴པ で ͖Διϑτ΢ΣΞͷ͢ ば ΍͍ ݟੵΓɺ࣮૷ɺ デプ ϩΠ がで ͖Δ༏लͳ プ ϩ グ ϥϚʔ ͷ૿Ճʹ͔͔͍ͬͯΔɻ ڧௐ౳͸Ҿ༻ऀʹΑΔ
70. 3VCZίϛϡχςΟଘଓͷ՝୊ w 
    3VCZΤίγεςϜͷൃల
    w 
    3VCZίϛϡχςΟͷ৽௠୅ँ
    w 
    3VCZίϛϡχςΟ಺Ͱͷ࿅౓ͷ޲্
    w 
    ࠃ಺Ͱͷ 3VCZϓϨθϯεͷҡ࣋
71. 3VCZJTU͕޾ͤʹ฻ΒͤΔɺ ΦʔηϯςΟοΫͰ͍ΒΕΔ 
 ΤϯδχΞϦϯά૊৫ΛٻΊͯʜ
72. ങͬͯ͘ ΕR
73. ʰݚᮎ3VCZϓϩάϥϛϯάʱ Ծ 
 ࢮܐࣥߦத
    ຋༁ਐߦத
    ೥ཅय़ ༧ఆ
    ֯୩৴ଠ࿠༁
    ϥϜμϊʔτࣾץο
    ೥݄
    ిॻЌ൛
    ൢച։࢝ر๬ ر๬ 
 ϖʔδ͋Δ<্࢙࠷ް>ͷͰ࣌ؒΛ͍ͩ͘͞ʜ