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Recap Pointfree Vol. 1~3
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freddi(Yuki Aki)
October 25, 2020
Programming
1
800
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
freddi(Yuki Aki)
October 25, 2020
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Transcript
2020/10/25 Recap Pointfree Vol. 1~3 iOSΞϓϦ։ൃͷͨΊͷFunctional Architectureใڞ༗ձ
ࠓճͷRecapͷΓํ • Pointfree Episode Vol 1 ~ 3 ͷ༰Λ͍͖ͬͯ·͢ •
ͨͩ͠ɺͯ͢Δͷ͕࣌ؒڐ͢ݶΓ • ొஃऀͷPlaygroundͰRecapͨ͠Γ༡ΜͰ͍͖·͢ • ղઆ͠ͳ͕ΒΔͷͰʮ͜͏͍͏ͷͰ͖Δʁʯ ͱ͔৭ʑʑΛೖΕΔͷ͓͢͢ΊͰ͢
Pointfree ͱ • ϓϩάϥϛϯάݴޠSwiftʹؔ͢ΔಈըͷγϦʔζ • ؔܕϓϩάϥϛϯάͱSwiftʹ͍ͭͯղઆ • Ұ෦Τϐιʔυߪಡ͕ඞਢ • https://www.pointfree.co/
“pointfree” ͱ • pointfree ͱ͍͏୯ޠࣗମʹ͍ͭͯҙຯ͕͋Δ
pointfree-style • Haskellͷؔͷॻ͖ํʢελΠϧʣ • … 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 ʹΑΔఆٛͱ͕ؔ࡞༻ ͢ΔۭؒͰɺʹ໌ࣔతʹݴٴ͠ͳ͍ఆٛΛ͞ ͍ͯ͠·͢ɻ
pointfree-style • ͨͱ͑ɺHaskell ͷ͜ͷॻ͖ํ f x = x + 1
Sun
pointfree-style • (point) ʹݴٴ͠ͳ͍ॻ͖ํͩͱ͜͏ॻ͚Δ • ͜Ε͕ઌఔͷ f ͷpointfree style f
= (+ 1) Sun
“pointfree” ͱ • ༨ஊͰ͋ΓDeep Dive͢Δͱ͕͘ͳΔͷͰׂѪ
ࠓ͢Pointfree ͷ Episode ʹ͍ͭͯ • Vol 1. Functions • Vol
2. Side Effects • Vol 3. UIKit Styling with Functions
Vol 1. Functions • ͪΐͬͱมΘͬͨελΠϧͷؔʹؔ͢Δॻ͖ํ • ͜Ε͔Βͷ Episode ΛݟΔ্Ͱඞਢͷ༰ •
৽͍͠ԋࢉࢠͷհ • |> ʹΑΔؔద༻, >>> ʹΑΔؔͷ߹
Vol 1. Functions • ݸਓతͳײಈ • ֤ԋࢉࢠʹΑΔ, left-to-right ͳίʔυͷ࡞ •
ؔΛ “Composition” ͢Δͱ͍͏ߟ͑ํ
Vol 2. Side Effects • ʮ෭࡞༻Λ੍ޚ͢ΔʯʹϑΥʔΧεͨ͠ Episode • print ͷྫ
• NumberFormatter ͷྫ • ԋࢉࢠ >=> ʹΑΔEffectΛ࣋ͬͨؔͷ߹ • ԋࢉࢠ <> ʹΑΔؔͷ߹ɺ<> ͷ ΦʔόʔϥΠυ
Vol 3. UIKit Styling with Functions • ࠓ·Ͱशͬͨ͜ͱΛͲͷΑ͏ʹ׆͔ͤΔ͔ʁ • ࣮ࡍʹίʔυ͕Massive
ʹͳΓͦ͏ͳUIViewͷྫ
ࢀߟࢿྉ • https://www.pointfree.co/ • https://wiki.haskell.org/Pointfree