Recap Pointfree Vol. 1~3

Recap Pointfree Vol. 1~3

https://gist.github.com/freddi-kit/112b3d13c6660339ddc85bd05ffc3c2b に Vol 3 で話す予定だったものあり

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freddi(Yuki Aki)

October 25, 2020
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  1. 2020/10/25 Recap Pointfree Vol. 1~3 iOSΞϓϦ։ൃͷͨΊͷFunctional Architecture৘ใڞ༗ձ

  2. ࠓճͷRecapͷ΍Γํ • Pointfree Episode Vol 1 ~ 3 ͷ಺༰Λ΍͍͖ͬͯ·͢ •

    ͨͩ͠ɺ͢΂ͯ΍Δͷ͸͕࣌ؒڐ͢ݶΓ • ొஃऀͷPlaygroundͰRecapͨ͠Γ༡ΜͰ͍͖·͢ • ղઆ͠ͳ͕Β΍ΔͷͰʮ͜͏͍͏ͷͰ͖Δʁʯ
 ͱ͔৭ʑ஡ʑΛೖΕΔͷ͓͢͢ΊͰ͢
  3. Pointfree ͱ͸ • ϓϩάϥϛϯάݴޠSwiftʹؔ͢ΔಈըͷγϦʔζ • ؔ਺ܕϓϩάϥϛϯάͱSwiftʹ͍ͭͯղઆ • Ұ෦Τϐιʔυ͸ߪಡ͕ඞਢ • https://www.pointfree.co/

  4. “pointfree” ͱ͸ • pointfree ͱ͍͏୯ޠࣗମʹ͍ͭͯ΋ҙຯ͕͋Δ

  5. pointfree-style • Haskellͷؔ਺ͷॻ͖ํʢελΠϧʣ • … So a 'points-free' definition of

    a function is one which does not explicitly mention the points (values) of the space on which the function acts. • … ͳͷͰɺʮpointfreeʯ ʹΑΔఆٛͱ͸ؔ਺͕࡞༻ ͢ΔۭؒͰɺ஋ʹ͸໌ࣔతʹ͸ݴٴ͠ͳ͍ఆٛΛ͞ ͍ͯ͠·͢ɻ
  6. pointfree-style • ͨͱ͑͹ɺHaskell ͷ͜ͷॻ͖ํ f x = x + 1

    Sun
  7. pointfree-style • ஋(point) ʹݴٴ͠ͳ͍ॻ͖ํͩͱ͜͏ॻ͚Δ • ͜Ε͕ઌఔͷ f ͷpointfree style f

    = (+ 1) Sun
  8. “pointfree” ͱ͸ • ༨ஊͰ͋ΓDeep Dive͢Δͱ࿩͕௕͘ͳΔͷͰׂѪ

  9. ࠓ೔࿩͢Pointfree ͷ Episode ʹ͍ͭͯ • Vol 1. Functions • Vol

    2. Side Effects • Vol 3. UIKit Styling with Functions
  10. Vol 1. Functions • ͪΐͬͱมΘͬͨελΠϧͷؔ਺ʹؔ͢Δॻ͖ํ • ͜Ε͔Βͷ Episode ΛݟΔ্Ͱඞਢͷ಺༰ •

    ৽͍͠ԋࢉࢠͷ঺հ • |> ʹΑΔؔ਺ద༻, >>> ʹΑΔؔ਺ͷ߹੒
  11. Vol 1. Functions • ݸਓతͳײಈ఺ • ֤ԋࢉࢠʹΑΔ, left-to-right ͳίʔυͷ࡞੒ •

    ؔ਺Λ “Composition” ͢Δͱ͍͏ߟ͑ํ
  12. Vol 2. Side Effects • ʮ෭࡞༻Λ੍ޚ͢ΔʯʹϑΥʔΧεͨ͠ Episode • print ͷྫ

    • NumberFormatter ͷྫ • ԋࢉࢠ >=> ʹΑΔEffectΛ࣋ͬͨؔ਺ͷ߹੒ • ԋࢉࢠ <> ʹΑΔؔ਺ͷ߹੒ɺ<> ͷ ΦʔόʔϥΠυ
  13. Vol 3. UIKit Styling with Functions • ࠓ·Ͱशͬͨ͜ͱΛͲͷΑ͏ʹ׆͔ͤΔ͔ʁ • ࣮ࡍʹίʔυ͕Massive

    ʹͳΓͦ͏ͳUIViewͷྫ
  14. ࢀߟࢿྉ • https://www.pointfree.co/ • https://wiki.haskell.org/Pointfree