Recap Pointfree Vol. 1~3

Transcript

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