Upgrade to Pro — share decks privately, control downloads, hide ads and more …

猫とたはむれる

Avatar for cedretaber cedretaber
May 15, 2017
Programming
960
2

 猫とたはむれる

ScalaのFP用ライブラリ cats の紹介です。

Avatar for cedretaber

cedretaber

May 15, 2017

More Decks by cedretaber

See All by cedretaber
関数型初心者におすすめしたい "OCaml"
Avatar for cedretaber cedretaber
1
1.1k
3ヶ月間Scalaと付き 合って感じた事　……という発表を想定していたのですが
Avatar for cedretaber cedretaber
3
3.2k

Other Decks in Programming

See All in Programming
Performance Engineering for Everyone
Avatar for Elena Tanasoiu elenatanasoiu
0
270
壊れたパーサから始める関数型設計と構成的なパーサ #fp_matsuri
Avatar for ライガー raiga0310
2
200
Snowflake Summitでの新機能 CoCo / CoWork / snowflake-summit-2026-overall-what-new-coco
Avatar for Tatsuhiro tatsuhiro
1
220
【SRE NEXT 2026 Lunch Session】一人目専任SREの立ち上げを加速する ― AIと進めたオンボーディングで2分を0.04秒にした話
Avatar for PKSHA Technology（パークシャテクノロジー） pkshadeck
PRO
0
2.4k
「正の参照」と 「負の導出」で組む ハーネスエンジニアリング
Avatar for Masahiro Watanabe cottpan
1
140
AIエージェントで 変わるAndroid開発環境
Avatar for takahirom takahirom
2
560
AI 輔助遺留系統現代化的經驗分享
Avatar for James Wang jame2408
1
1.2k
Vue × Nuxt × Oxc どこまで使える？実運用の現在地
Avatar for ANDPAD inc andpad
0
370
はてなアカウント基盤 State of the Union
Avatar for cockscomb cockscomb
1
1.3k
SREは、MCPとSRE Agentをこう使え！
Avatar for kazumax55 kazumax55
0
150
The Bowling Game - From Imperative to Functional Programming - Part 1
Avatar for Philip Schwarz philipschwarz
PRO
0
310
Claude Team Plan導入・ガイド
Avatar for tk3fftk tk3fftk
0
180

Featured

See All Featured
Why Your Marketing Sucks and What You Can Do About It - Sophie Logan
Avatar for Sophie Logan marketingsoph
0
230
Side Projects
Avatar for Sacha Greif sachag
455
43k
How To Speak Unicorn (iThemes Webinar)
Avatar for Michelle Schulp Hunt marktimemedia
1
500
Visualization
Avatar for Eitan Lees eitanlees
152
17k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
508
140k
The World Runs on Bad Software
Avatar for Brandon Keepers bkeepers
PRO
72
12k
Believing is Seeing
Avatar for Spiro Bolos oripsolob
1
170
10 Git Anti Patterns You Should be Aware of
Avatar for Lemi Orhan Ergin lemiorhan
PRO
659
62k
Prompt Engineering for Job Search
Avatar for Mfonobong Umondia mfonobong
0
370
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
Avatar for Stéphanie Walter stephaniewalter
287
14k
How to audit for AI Accessibility on your Front & Back End
Avatar for davetheseo davetheseo
0
460
The MySQL Ecosystem @ GitHub 2015
Avatar for Sam Lambert samlambert
251
13k

Transcript

  1. ೣͱͨ͸ΉΕΔ @cedretaber

  2. Twitter / Github @cedretaber ͓࢓ࣄ Scala TypeScript झຯ Ruby Erlang

    / Elixir F# Dݴޠ

  3. cats ࠓճ͝঺հ͢Δͷ͸typelevel / cats 4DBMBͰ'1Λߦ͏ҝͷϥΠϒϥϦ 4DBMB[ͱ͔ͷϑϨϯζ

  4. Why cats? ࢖͍΍͍͢σʔλܕ͕ ἧ͍ͬͯΔ 4DBMBඪ४ͷσʔλܕʹ ΋ศརͳؔ਺Λ஫ೖ͠ ͯ͘ΕΔ ιʔε͕ಡΈ΍͘͢ݟ ָ͍͍ͯͯ͠

  5. NonEmptyList

  6. ʮઈରʹۭ͡Όͳ͍ࣄ͕อূ͞ΕͨʯϦετɻ ʮ͜͜Ͱ౉ͬͯ͘ΔϦετ͸ۭ͡Όͳ͍ʯͬͯ࣌ʹ ࢖͏ɻ

  7. None

  8. Ϧετͱͷ૬ޓม׵ /PO&NQUZ-JTUΛ࢖͍͍ͨ৔໘͸-JTUΛ࢖͍͍ͨ৔ ໘ʹแؚ͞Ε͍ͯΔ͸ͣͳͷͰɺϦετͱͷ૬ޓม ׵͸ଟ༻͢Δɻ

  9. None

  10. ͦͷଞͷϝιου /PO&NQUZ-JTU͸ී௨ͷϦετͷϝιου͕֓Ͷ࣮ ૷͞Ε͍ͯΔɻ ·ͨɺ4FNJHSPVQ,ɺ5SBWFSTFɺ.POBEͳͲͷΠ ϯελϯεͳͷͰɺศརͳϝιου΋਺ଟ͘࢖͑Δ ʢۭͷঢ়ଶ͕ଘࡏ͠ͳ͍ͨΊɺϞϊΠυͰ͸ͳ͘൒ ܈ͳͷͰ஫ҙɻʣ

  11. None
  12. None
  13. None

  14. ෇ه NonEmptyVector NonEmptyStream ΋͋Δɻ

  15. Validated

  16. ʮ-FGUΛ஝ੵ͢Δ&JUIFSʯ ໊લͷ௨ΓɺόϦσʔγϣϯΛ͔͚Δ࣌౳ʹॏๅ͢ Δɻ

  17. ྫ Ϣʔβొ࿥ͷॲཧΛߟ͑Δɻ Ϣʔβ*%͸ॏෳෆՄɺύεϫʔυ͸จࣈҎ্ɺΈ ͍ͨͳͷ৚͕݅͋Δͱ͢Δɻ

  18. None

  19. ͜ͷ࣮૷ͩͱɺ*%ͱύεϫʔυͷ྆ํʹ໰୊͕͋Δ ৔߹΋*%ͷΤϥʔ͔͠ฦΒͳ͍ɻ όϦσʔγϣϯΛߦ͏৔߹ɺೖྗʹଘࡏ͢Δશͯͷ ϛεΛฦ͢ํ͕Ϣʔβʹ༏͍͠ɻ ͳͷͰɺ7BMJEBUFEΛ࢖͏ɻ

  20. None
  21. None

  22. /PO&NQUZ-JTUͱͷซ༻ ઌड़ͷྫͩͱ4USJOHΛ࢖ͬͯΤϥʔΛ஝ੵ͕ͨ͠ɺ จࣈྻΛͪ͝Όͪ͝Όͱ઀ଓͯ͠͠·͏ͷ͸͋·Γ ៉ྷͳ΍Γํͱ͸ݴ͑ͳ͍ɻ ͳͷͰɺ/PO&NQUZ-JTUΛ࢖ͬͯ஝ੵͯ͠ΈΔɻ

  23. Ͳ͏ͯ͠/PO&NQUZ-JTUͳͷ͔ʁ ผʹ௨ৗͷ-JTUͰ΋ྑ͍ͷ͕ͩɺ7BMJEBUFEͷ৔߹ɺ *OWBMJEʹͳΔ࣌͸ԿΒ͔ͷ஋͕ೖ͍ͬͯΔ͸ͣͳͷ Ͱɺ*OWBMJE͔ͭத਎͕ۭͱ͍͏ࣄ͸͋Γ͑ͳ͍ɻ ͳͷͰɺ/PO&NQUZ-JTUͷํ͕૬Ԡ͍͠ɻ

  24. None

  25. 7BMJEBUFE /PO&NQUZ-JTUͷ૊Έ߹Θͤ͸ඇৗʹ Α͘࢖͏ͷͰɺDBUTʹ͸*OWBMJEΛ/PO&NQUZ-JTU ͱ૝ఆͨ͠7BMJEBUFE/FMͱ͍͏ܕ͕༧Ί༻ҙ͞Ε ͍ͯΔɻ ˣఆٛ

  26. None

  27. ෇ه ʮਖ਼͍͠஋Λฦͭͭ͠ɺ ్தܦաͷԿ͔΋஝ੵ ͍ͨ͠ʯͱ͍͏৔߹͸ Iorͱ͍͏σʔλܕ͕࢖ ͑Δɻ

  28. List, Either

  29. ҉໧ͷม׵Λར༻ͯ͠ɺDBUT͸طଘͷΫϥεʹ΋৭ʑ ͳϝιουΛੜ΍ͯ͘͠ΕΔɻ ಛʹɺ-JTU΍&JUIFSͷ֦ு͕ศརɻ 5SBWFSTF΍'PMEBCMF͸Ͳ͜·Ͱ΋ศརɻ YҎલͳΒ&JUIFSʹNBQqBU.BQΛੜ΍ͯ͠ ͘ΕΔͷ΋ศརɻ

  30. None
  31. None
  32. None
  33. None
  34. None
  35. None

  36. 6OBQQMZʹ͍ͭͯ ্Ͱ&JUIFS΍7BMJEBUFEͷ-JTUʹTFRVFODF΍ USBWFSTFΛద༻͍ͯ͠ΔͷΛݟͯɺٙ໰ʹײͨ͡ํ ΋ଟ͍ͩΖ͏ɻ ͱ͍͏ͷ΋ɺ෦෼ద༻͞ΕͨܕҾ਺Λਪ࿦Ͱ͖ͳ͍ ͱ͍͏໰୊ʢ4*ʣ͸༗໊ͰɺͦΕʹରԠ͢Δ ͨΊʹDBUT͸6OBQQMZΛ࢖͍͔ͬͯͨΒͩɻ

  37. None

  38. ͔͜͠͠ͷ໰୊͸೥ఔલʹղܾ͞Ε͓ͯΓɺ 4DBMB͔Β͸ܕਪ࿦͕վળ͞Ε͍ͯΔɻ ·ͨچόʔδϣϯͷ4DBMBͰ΋ɺTCUͷϓϥάΠϯΛ ࢖͏ࣄͰಉ౳ͷػೳΛར༻Ͱ͖Δɻ ͜ΕΛड͚ͯDBUTͰ͸ɺٞ࿦ͷ຤ɺ6OBQQMZͷར ༻Λίʔυ͔Βഉআ͢Δࣄʹͨ͠Β͍͠ɻ

  39. ऴΘΓʹ

  40. DBUT΍TDBMB[ʹ༻ҙ͞Εͨศརͳؔ਺Λ࢖͏ͱɺ΍ ΍͍͜͠ॲཧΛεοΩϦͱॻ͘ࣄ͕Ͱ͖Δɻ ಛʹUSBWFSTF΍TFRVFODFͳͲ͸ɺ࠶ؼؔ਺΍ GPME-FGUΛۦ࢖ͯ͠ॻ͜͏ͱ͢ΔͱͲ͏ͯ͠΋ෳࡶ ʹͳͬͯ͠·͏ɻ

  41. ͨͩ͠ɺແҋʹ࢖͑͹͍͍ͱ͍͏Θ͚Ͱ΋ͳ͍ͷͰ ஫ҙɻ ݟ׳Εͳ͍ϝιουΛ࢖͏ΑΓɺ࠶ؼؔ਺ͱ GPME-FGUͰॻ͍ͨํ͕ʢिؒޙͷࣗ෼ΛؚΊͨʣ ଞਓʹͱͬͯಡΈ΍͍͢ࣄ΋͋Δɻ ͦͷ͋ͨΓ͸νʔϜͷ܏޲ͳͲݟͭͭௐ੔͍͖ͯ͠ ·͠ΐ͏ɻ

  42. ࢀߟࢿྉ w UZQFMFWFMDBUT IUUQTHJUIVCDPNUZQFMFWFMDBUT w ೣ൪ IUUQFFETJODPNIFSEJOHDBUT