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Flutter 2021 の振り返りと今後のアプリ開発に向けて / Looking back on Flutter 2021 and for future app development.

Flutter 2021 の振り返りと今後のアプリ開発に向けて / Looking back on Flutter 2021 and for future app development.

Daichi Furiya (Wasabeef)

December 11, 2021
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  1. Flutter 2021 ͷৼΓฦΓͱ

    ࠓޙͷΞϓϦ։ൃʹ޲͚ͯ
    Daichi Furiya / Wasabeef


    CyberAgent, Inc.
    Tokyo, Japan

    View Slide

  2. Flutter 2021 ͷৼΓฦΓͱࠓޙͷΞϓϦ։ൃʹ޲͚ͯ
    1. ΫϩεϓϥοτϑΥʔϜͷݱঢ়ͱ՝୊


    2. 2022೥΋ Flutter Λબ୒͢Δ͔Ͳ͏͔


    3. Flutter ͱ Dart ͷΞοϓσʔτ


    4. Flutter ΞϓϦ։ൃͷࠓޙʹ޲͚ͯ


    4.1. ΞϓϦͷΞʔΩςΫνϟ


    4.2. React ͔Βֶͼ͍ͨ͜ͱ

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  3. ΫϩεϓϥοτϑΥʔϜ
    ͷݱঢ়ͱ՝୊

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  4. ΫϩεϓϥοτϑΥʔϜͷݱঢ়ͱ՝୊
    1. ΫϩεϓϥοτϑΥʔϜͰ։ൃ͢Δલʹ஌͓ͬͯ͘΂͖͜ͱ


    1. ϝϦοτɾσϝϦοτ


    2. Kotlin Multiplatform


    3. Compose Multiplatform


    2. Flutter ͷ࠾༻ࣄྫ

    View Slide

  5. ΫϩεϓϥοτϑΥʔϜͰ։ൃ͢Δલʹ஌͓ͬͯ͘΂͖͜ͱ

    View Slide

  6. ΫϩεϓϥοτϑΥʔϜͰ։ൃ͢Δલʹ஌͓ͬͯ͘΂͖͜ͱ
    • ΫϩεϓϥοτϑΥʔϜͰ։ൃ͢ΔҙຯΛߟ͑Δ

    → ԿΛڞ௨Խ͍͔ͨ͠ʁ


    • ʮͱΓ͋͑ͣ Flutter ͕ྲྀߦͬͯΔΒ͍͔͠Β Flutter Ͱ΍ͬͱ͚
    ͹͍͍ʯͰ͸ͳ͍


    • ͜Ε·Ͱొ৔͖ͯͨ͠਺ଟͷΫϩεϓϥοτϑΥʔϜϑϨʔϜ
    ϫʔΫ͕ਁಁ͠ͳ͔ͬͨ͜ͱ
    اۀͱͯ͠औΓ૊Ή৔߹

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  7. ΫϩεϓϥοτϑΥʔϜͰ։ൃ͢ΔҙຯΛߟ͑Δ
    QɿԿΛڞ௨Խ͍͔ͨ͠ʁ
    A1ɿϩδοΫ͚ͩڞ௨Խ͢Δ


    A2ɿUI ΋ϩδοΫ΋ڞ௨Խ͢Δ


    A3ɿࠓ͸ϩδοΫ͚ͩͰকདྷతʹ͸


    ɹɹ UI ΋ڞ௨Խ͢Δ
    UI
    ϩδοΫ
    List Button
    Domain
    Label Nav
    Media Notification Sensors
    Business Logic
    Networking Database
    etc..
    etc..
    Log Utils

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  8. ΫϩεϓϥοτϑΥʔϜͰ։ൃ͢ΔҙຯΛߟ͑Δ
    QɿԿΛڞ௨Խ͍͔ͨ͠ʁ
    A1ɿϩδοΫ͚ͩڞ௨Խ͢Δ


    A2ɿUI ΋ϩδοΫ΋ڞ௨Խ͢Δ


    A3ɿࠓ͸ϩδοΫ͚ͩͰকདྷతʹ͸


    ɹɹ UI ΋ڞ௨Խ͢Δ
    UI
    ϩδοΫ
    UI + ϩδοΫ

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  9. ϝϦοτɾσϝϦοτ

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  10. ϝϦοτ
    • ΤϯδχΞͷϦιʔεઅ໿


    • ਓ਺ɾ։ൃظؒ୹ॖ


    • ։ൃίϛϡχςΟͷٸ଎తͳ
    ֦େʢࠃ಺֎ɺFlutterKaigi ͳͲʣ


    • iOS/Android Ͱڞ௨ͷ UI

    ʢྑ͘΋ʣ
    σϝϦοτ
    • ΞϓϦಈ࡞ͷ҆ఆੑ

    ʢωΠςΟϒʹ͸ྼΔʣ


    • কདྷੑɺઌߦ͖ෆ҆

    ʢͲͷϑϨʔϜϫʔΫΛ࠾༻͢Δ͔ʣ


    • iOS/Android Ͱڞ௨ͷ UI

    ʢѱ͘΋ʣ


    • iOS/Android ͷ৽ػೳ΁ͷ௥
    ैͷ஗ΕΔ

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  11. ΤϯδχΞͷϦιʔεઅ໿
    αʔόΤϯδχΞ
    iOS ΤϯδχΞ
    Web ΤϯδχΞ
    Android ΤϯδχΞ
    Ұൠతͳ Swift/Kotlin ΞϓϦͷΞαΠϯελΠϧ


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  12. ΤϯδχΞͷϦιʔεઅ໿
    ΫϩεϓϥοτϑΥʔϜͰͷΞαΠϯελΠϧ
    ΞϓϦΤϯδχΞ
    ͱΓ͋͑ͣ1ਓҎ্͍Ε͹ iOS/
    Android ΞϓϦ྆ํ։ൃՄೳ
    αʔόΤϯδχΞ Web ΤϯδχΞ
    ༨৒

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  13. ΤϯδχΞͷϦιʔεઅ໿
    αʔόΤϯδχΞ
    iOS ΤϯδχΞ
    Web ΤϯδχΞ
    Android ΤϯδχΞ
    Ұൠతͳ Swift/Kotlin ΞϓϦͷΞαΠϯελΠϧ


    ϨϏϡʔ͞Εͳ͍ෆ҆

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  14. ΤϯδχΞͷϦιʔεઅ໿
    ΫϩεϓϥοτϑΥʔϜͰͷΞαΠϯελΠϧ
    αʔόΤϯδχΞ
    ΞϓϦΤϯδχΞ
    Web ΤϯδχΞ
    ͱΓ͋͑ͣ1ਓҎ্͍Ε͹ iOS/
    Android ΞϓϦ྆ํ։ൃՄೳ


    ίʔυϨϏϡʔͰ͖ͯ݁Ռͱͯ͠
    ඼࣭޲্΋ɻ

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  15. iOS/Android Ͱڞ௨ͷ UIʢѱ͘΋ʣ
    Flutter ͸ϚςϦΞϧσβΠϯΛ࠾༻͍ͯ͠ΔͷͰɺѱ͘ݴ͏
    ͱ iOS ͬΆ͍σβΠϯ͕ଛͳΘΕ͍ͯͨΓ͢Δ͜ͱ͕͋Γ·
    ͢ɻͨͩɺͦΕ͸։ൃ଎౓ͷ޲্ͷͨΊʹσβΠϯγεςϜ
    ͸ Flutterʢڞ௨ʣͱͯ͠ߟ͑ͨํ͍͍ͱͯ͠ࢥ͍ͬͯ·͢ɻ

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  16. iOS/Android Ͱڞ௨ͷ UIʢѱ͘΋ʣ
    Cupertino widgets ΋͋Δఔ౓ଘࡏ͢Δ͕׬ᘳͰ͸ͳ͍ͷͰɺiOS Β͍͠σβΠϯʹ׬શʹ
    ౿ऻ͍ͨ͠৔߹͸ΫϩεϓϥοτϑΥʔϜʹ͸͠ͳ͍ͱ͍͏ͷબ୒ࢶ΋ࢹ໺ʹ͍Ε͍ͨ

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  17. কདྷੑɺઌߦ͖ෆ҆
    ։ൃݩͷاۀ͕͍͔ʹେ
    اۀͩΖ͏ͱΤϯδχΞ
    ίϛϡχςΟʹड͚͕ྑ
    ͘ͳ͍ͱྲྀߦΒͳ͍

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  18. iOS/Android ͷ৽ػೳ΁ͷ௥ैͷ஗Εʁ
    ྫ͑͹ iOS 15ɺAndroid 12 ͷରԠ͕க໋తʹ஗Ε͍ͯͯ։ൃͰ͖ͳ͍ͱ͍͏ײ֮͸ͳ
    ͍͕ɺ֤ OS ͷ৽ API ͷΠϯλʔϑΣʔεެ։͕ޙ௥͍ͰདྷΔͷ͸ࣄ࣮ͱͳΓ·͢

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  19. Kotlin Multiplatform

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  20. Kotlin Multiplatform
    • JetBrains ʹΑͬͯ։ൃ


    • UI ͷڞ௨Խ͸ͤͣɺϏδωεϩ
    δοΫͷڞ௨ԽʹಛԽ͍ͯ͠Δ
    ʢೝূɺϩάͳͲͷڞ௨Խʣ


    • Kotlin Ͱ Backends for
    Frontends
    Kotlin/LLVM
    Kotlin/JVM Kotlin/JVM
    Kotlin/JS
    Common code

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  21. Compose Multiplatform

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  22. Compose Multiplatform
    • 1.0.0 (Dec 2021)


    • Jetpack Compose ϕʔεͰ Jetbrains ʹΑΔ։ൃ


    • ݩʑ͸ Compose for Desktop ͩͬͨ΋ͷ


    • ݱࡏ͸ओʹ Desktop / Web ΞϓϦ޲͚ʢAndroid Ͱ΋ಈ͘ʣ


    • ݱஈ֊Ͱ͸ iOS ΁ͷެࣜαϙʔτ͸ൃද͞Ε͍ͯͳ͍


    • άϥϑΟοΫΤϯδϯ͸ Skia Λར༻͍ͯ͠Δ

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  23. Skia
    • άϥϑΟοΫϥΠϒϥϦ
    • Android, Chrome, Firefox, Blink, Flutter Ͱ࠾༻͞Ε͍ͯΔ
    • Skia ͸ Vulkan ΛόοΫΤϯυΤϯδϯͱͯ͠มߋՄೳ
    • Android 9 Ҏ߱ɺσϑΥϧτͷϨϯμϥʔ͸ Skia ʹͳ͍ͬͯΔ
    ʢ8 ͱ 9 ͰUI͕มΘͬͨͷ͸ͦͷͨΊʣɻFlutter ʹ͢ΔͱϨΠ
    Ϡʔ͕૿͑Δ΋ͷͷϨϯμϥʔ͸ಉ͡

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  24. Skia
    • ΋ͪΖΜ iOS Ͱ΋ Windows Ͱ΋ಈ࡞͢Δ
    ରԠϓϥοτϑΥʔϜ
    • Windows 7, 8, 8.1, 1
    0

    • macOS 10.10.5 or late
    r

    • iOS 8 or late
    r

    • Android 4.1 (JellyBean) or late
    r

    • Ubuntu 14.04+, Debian 8+, openSUSE 13.3+, or Fedora Linux 24+

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  25. Flutter ͷ࠾༻ࣄྫ

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  26. Flutter ͷ࠾༻ࣄྫ
    https://medium.com/flutter/announcing-flutter-2-8-31d2cb7e19f5
    5݄ 200,000 ΞϓϦ





    12݄ 375,000 ΞϓϦ


    ͜͜ 6 ϲ݄Ͱ 1.87 ഒ
    App Store

    View Slide

  27. 2022೥΋ Flutter Λબ୒
    ͢Δ͔Ͳ͏͔

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  28. 2022೥΋ Flutter Λબ୒͢Δ͔Ͳ͏͔
    1. ΫϩεϓϥοτϑΥʔϜ͔ʁ֤ϓϥοτϑΥʔϜ͔ʁ


    1.1. ΞϓϦͷػೳཁ݅͸ʁ


    1.2. ΤϯδχΞͷಘҙྖҬɺͦͷਓ਺ɺظؒ͸ʁ


    2. React Native ͸ʁ.NET MAUI ͸ʁ


    3. Compose Multiplatform ͷ୆಄͸ʁ

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  29. ΫϩεϓϥοτϑΥʔϜ͔ʁ֤ϓϥοτϑΥʔϜʢiOS / Androidʣ͔ʁ
    ɹΫϩεϓϥοτϑΥʔϜɹ ɹ֤ϓϥοτϑΥʔϜʢiOS / Androidʣ
    • UI ΍ϏδωεϩδοΫ͕ iOS /
    Android Ͱҧ͏


    • ҆ఆͯ͠ΫΦϦςΟ͕ߴ͍΋ͷ࡞
    Γ͍ͨ


    • iOS / Android ͷܦݧऀ͕͍Δ


    • εέδϡʔϧʹ༨༟͕͋Δ
    ྫ ྫ
    • UI ΍ϏδωεϩδοΫ͕ iOS /
    Android Ͱಉ͡


    • ٕज़౤ࢿతͳνϟϨϯδΛ͍ͨ͠


    • iOS / Android ͷܦݧऀ͕গͳ͍

    ʢΤϯδχΞͷ਺͕গͳ͍ʣ


    • εέδϡʔϧʹ༨༟͕ͳ͍


    View Slide

  30. ΞϓϦͷػೳཁ݅͸ʁ

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  31. ΞϓϦͷػೳཁ݅͸ʁ
    • iOS ͱ Android Ͱ UI ͷମݧ͕શ͘ҧ͏ʁ

    → Flutter ͸ཱͪҐஔ͕ UI ϑϨʔϜϫʔΫͳͷͰཁ͕݅ͦ΋ͦ΋͍͋ͬͯͳ͍͔΋


    • ಈըͳͲͷίϯςϯπΛදࣔ͢Δͷʹ DRM ͕ඞཁʁ

    → Flutter ͚ͩͰ࣮૷͢Δͷ͸ݱஈ֊Ͱ͸ FairPlay ରԠͨ͠ϥΠϒϥϦ͕ͳ͍


    • οοΰϦοοΰϦͷΞχϝʔγϣϯ͕͋Δʁ

    → ύϑΥʔϚϯε͕ωΠςΟϒΑΓྼΔͷͰཁݕূ

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  32. ΤϯδχΞͷಘҙྖҬɺͦͷਓ਺ɺظؒ͸ʁ

    View Slide

  33. ΤϯδχΞͷಘҙྖҬɺͦͷਓ਺ɺظؒ͸ʁ
    αʔόΤϯδχΞ Web ΤϯδχΞ
    ਓΛ૿΍ͤͣʹͲ͏ʹ͔͠ͳ͍ͱ͍͚ͳ͍৔߹

    View Slide

  34. ΤϯδχΞͷಘҙྖҬɺͦͷਓ਺ɺظؒ͸ʁ
    αʔόΤϯδχΞ
    ΞϓϦΤϯδχΞ
    Web ΤϯδχΞ
    iOS / Android ஌͕ࣝ΄ͱΜͲͳ͍৔߹ʹ
    ผʑʹ࡞ͬͯ྆ํΛಉ࣌ʹϦϦʔε͢Δ
    ͷ͸ݱ࣮తʹ͸ෆՄೳ

    View Slide

  35. ΤϯδχΞͷಘҙྖҬɺͦͷਓ਺ɺظؒ͸ʁ
    αʔόΤϯδχΞ
    ΞϓϦΤϯδχΞ
    Web ΤϯδχΞ
    ͜ͷύλʔϯͰ͸࣮֬ʹΫϩεϓϥοτ
    ϑΥʔϜ͕༗ޮʹͳͬͯ͘Δ


    ·ͨɺFlutter ͕ෛ࠴ʹͳΔՄೳੑ΋͜Ε
    ·ͰͷΫϩεϓϥοτϑΥʔϜϑϨʔϜ
    ϫʔΫʹൺ΂Δͱ௿͍ʢͱࢥ͏ʣ

    View Slide

  36. React Native ͸ʁ.NET MAUI ͸ʁ

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  37. React Native ͸ʁ
    • Web ํ໘ʹڧ͍ΤϯδχΞ͕͍Δ৔߹ͳͲͷબ୒ࢶ

    → νʔϜͷಘҙྖҬ΍ٕज़ࢿ࢈ʹΑܾͬͯఆ


    • ϝϧΧϦ US ͕ React Native Ͱॻ͖௚ͨ͠Β͍͠

    → https://link.medium.com/SNFEPzc1Rlb


    • Facebook ΍ Coinbase ΍ Discord ΍ Tesla ͱ͍ͬͨ༗໊ͳاۀ΋࠾༻

    → https://reactnative.dev/showcase


    • npm ʹ͋Δࢿ࢈Λࢧ͑Δͷ͸ڧΈ

    ʢ༨ஊɿϒϩοΫνΣʔϯؔ࿈ٕज़͸ React Native ޲͚ͷ SDK ʹ͔͠ରԠ͍ͯ͠ͳ͍৔߹͕ଟ͍ʣ

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  38. .NET MAUI ʢچ Xamarin.Formsʣ͸ʁ
    • C# ํ໘ʹڧ͍ΤϯδχΞ͕͍Δ৔߹ͳͲͷબ୒ࢶ

    → νʔϜͷಘҙྖҬ΍ٕज़ࢿ࢈ʹΑܾͬͯఆ


    • ৽ܕίϩφ΢Πϧε઀৮֬ೝΞϓϦ͸ Xamarin Λ࠾༻


    • .NET MAUI ʹͳΔͱ XML ΛࣙΊએݴత UI Ͱॻ͚Δ


    • ࣄྫ͕ Flutter ΍ React Native ʹൺ΂Δͱগͳ͍

    View Slide

  39. Compose Multiplatform ͷ୆಄͸ʁ

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  40. Compose Multiplatform ͷ୆಄͸ʁ
    • ୆಄͢Δ͔΋͠Εͳ͍͕ɺͦΕ͕ 2022 ೥ʹϞόΠϧ޲͚
    ʹ Production Ready ʹͳΔՄೳੑ͸௿͍

    → ݱஈ֊Ͱ iOS ͷਖ਼ࣜαϙʔτ͕ೖ͍ͬͯͳ͍


    • ͦͷ൑அ͕Ͱ͖Δͷ͕΋͏গ͠ઌʹͳΓͦ͏

    View Slide

  41. • ৽نϓϩδΣΫτ


    • গਓ਺ʢ1ਓʙʣ


    • গਓ਺Ͱ΋྆ϓϥοτϑΥʔ
    ϜͰϒϥϯσΟϯάͷҰ؏ੑ
    Λҡ͍࣋ͨ͠


    • ͱʹ͔͘ૣ͘ϦϦʔε͍ͨ͠


    • ΑΓνϟϨϯδ͍ͨ͠

    ɹFlutterɹ
    Flutter ͔ʁ Kotlin MPP ͔ʁ+ Compose Multiplatform ͔ʁ
    ɹKotlin MPPɹ
    • ৽ن / طଘϓϩδΣΫτ


    • େਓ਺ʢ10ਓʙʣ


    • iOS/AndroidΞϓϦ։ൃͷਫ਼
    ௨͍ͯ͠Δ


    • ϦεΫΛ཈͍֤͑ͨϓϥοτ
    ϑΥʔϜͰ෼͚ͯσβΠϯΛ
    ߆Γ͍ͨ

    ɹ+ Compose Multiplatformɹ
    • ݕূʢ৽نʣϓϩδΣΫτ


    • গਓ਺Ͱ΋྆ϓϥοτ
    ϑΥʔϜͰϒϥϯσΟϯά
    ͷҰ؏ੑΛҡ͍࣋ͨ͠


    • ͱʹ͔͘ૣ͘ϦϦʔεͨ͠
    ͍


    • কདྷ΁ͷٕज़౤ࢿΛ͍ͨ͠

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  42. • UI ΋ϏδωεϩδοΫ΋ڞ
    ௨ԽͰ͖Δ


    • ࣄྫ͕ଟ͍


    • Google Λ৴͍ͯ͡Δ



    ɹFlutterɹ Kotlin MPP + Compose


    ɹɹɹɹɹɹ Multiplatform
    • Web / React ϝϯόʔ͕ଟ͍

    ʢWeb ͷࢿ࢈Λ࢖͍͍ͨʣ


    • UI ΋ϏδωεϩδοΫ΋ڞ
    ௨ԽͰ͖Δ


    • ࣄྫ͕ଟ͍ʢ͕ࠃ಺ͷ੎͍͸ྼΔʣ


    • Facebook Λ৴͍ͯ͡Δ


    • Android / Kotlin ϝϯόʔ͕
    ଟ͍ʢKotlin ͷࢿ࢈Λ࢖͍͍ͨʣ


    • ॳظஈ֊͸ϏδωεϩδοΫ
    ͚ͩڞ௨Խ͠ Compose
    Multiplatform ͕҆ఆͨ͠λ
    ΠϛϯάͰ UI Λॻ͖௚͢ύ
    λʔϯ


    • Jetbrains Λ৴͍ͯ͡Δ



    React Native

    2022೥΋ Flutter Λબ୒͢Δ͔Ͳ͏͔

    View Slide

  43. Flutter ͱ Dart ͷ


    Ξοϓσʔτ

    View Slide

  44. Flutter 2.8

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  45. Flutter 2.8
    1. ύϑΥʔϚϯε޲্

    ʢGoogle Pay ͰىಈςετͰ 10 ʙ 50% ͷ޲্ʣ
    2. Android systrace ʹ Flutter ͷύϑΥʔϚϯετϨʔεΛૹ৴͢ΔΑ͏ʹมߋ
    3. Flutter DevTools ʹ Enhance Tracing ௥ՃʢUI δϟϯΫ਍அͳͲʹ༗ޮʣ
    4. FirebaseʢFlutterFireʣPlugin ͷ҆ఆ൛ϦϦʔε
    4.1. Firebase UI ʢೝূ΢ΟδΣοτʣͷϦϦʔε
    5. Desktop ൛ͷߋ৽ʢ׽ࣈ IME αϙʔτͳͲʣ
    6. Dev channel ͷഇࢭʢࠓޙ͸ master, beta, master Ͱӡ༻ʣ
    https://link.medium.com/a7Md15TNPlb

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  46. Firebase UI
    https://link.medium.com/a7Md15TNPlb
    • ೝূը໘ͷ΢ΟδΣοτ


    • Firebase Auth Λར༻


    • Email, Google, Meta,
    Twitter, Apple ʹରԠ

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  47. Dart 2.15

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  48. View Slide

  49. Dart 2.15
    1. Isolate class ͷػೳ޲্
    2. Constructor tear-off
    s

    3. enum ʹ API ௥Ճ
    4. ϥΠϒϥϦ։ൃ޲͚Ͱ pub ʹػೳ௥Ճ
    https://link.medium.com/kZTQCmukPlb

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  50. Isolate ͷػೳ޲্
    લఏͱͯ͠ɿDart Ͱ 16ms Λ௒͑ͯϑϨʔϜϨʔτΛམͱ͢Α͏ͳॲཧΛ͢Δ
    ৔߹ʹ͸ Isolate Λར༻ͯ͠ Worker Isolate Ͱ࣮ߦ͢Δ͜ͱΛਪ঑͞Ε͍ͯΔ
    ʢωοτϫʔΫϨεϙϯεΛͨͩ଴͍ͬͯΔ͚ͩͷΑ͏ͳॲཧͷ৔߹ͦͷݶΓ
    Ͱ͸ͳ͍ʣ
    Dart 2.15Ͱ͸ Worker Isolate ͔ΒϝϞϦΛίϐʔͤͣʹ Isolate.exit() Ͱ݁ՌΛ
    ฦ͢͜ͱ͕Ͱ͖Δɻ Flutter ͷ compute Λطʹར༻͍ͯ͠Δ৔߹͸ Flutter 2.8
    ͷΞοϓάϨʔυ͢Δ͜ͱͰࣗಈతʹύϑΥʔϚϯε͕޲্͢Δ
    https://link.medium.com/kZTQCmukPlb

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  51. https://link.medium.com/kZTQCmukPlb
    // Isolate.spawn


    final p = ReceivePort();


    await Isolate.spawn(_read, p.sendPort);


    await p.first;


    // Isolate.exit


    Future _read(SendPort p) async {


    final fileData =


    await File(filename).readAsString();


    final jsonData = jsonDecode(fileData);


    Isolate.exit(p, jsonData);


    }


    final fileData = File(fileName);


    // compute


    compute(_read, jsonData);


    List _read(File filename) {


    final fileData =


    await File(filename).readAsString();


    final jsonData = jsonDecode(fileData);


    }


    Isolate ͷػೳ޲্
    Flutter ͷ computeʢத਎͸ Dart ͷ Isolateʣ
    Dart ͷ Isolate

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  52. Isolate ͷػೳ޲্
    https://link.medium.com/kZTQCmukPlb
    void main() async {


    final jsonData = await _parseInBackground();


    print('number of JSON keys = ${jsonData.length}');


    }


    // Isolate.spawn


    Future> _parseInBackground() async {


    final p = ReceivePort();


    await Isolate.spawn(_readAndParseJson, p.sendPort);


    return await p.first;


    }


    // Isolate.exit


    Future _readAndParseJson(SendPort p) async {


    final fileData = await File(filename).readAsString();


    final jsonData = jsonDecode(fileData);


    Isolate.exit(p, jsonData);


    }

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  53. Constructor tear-offs
    https://link.medium.com/kZTQCmukPlb
    class Hoge {


    Hoge() {


    print(‘Called Hoge()’);


    }


    }


    void main() {


    const hoge = Hoge.new;


    hoge();


    }
    // Lambda


    names.forEach((name) {


    print(name);


    });


    // Tear-off


    names.forEach(print);


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  54. Constructor tear-offs
    https://link.medium.com/kZTQCmukPlb
    class FruitWidget extends StatelessWidget {


    @override


    Widget build(BuildContext context) {


    return Column(


    children: ['Apple', 'Orange'].map((value) => Text(value)).toList());


    }


    }
    class FruitWidget extends StatelessWidget {


    @override


    Widget build(BuildContext context) {


    return Column(


    children: ['Apple', 'Orange'].map(Text.new).toList());


    }


    }
    Ҏલ͸ .map ʹϥϜμΛ౉͍͕ͯͨ͠
    ίϯετϥΫλͰ΋ tear-off Ͱ͖ΔΑ͏ʹͳͬͨ

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  55. enum ʹ API ௥Ճ
    https://link.medium.com/kZTQCmukPlb
    enum MyEnum { one, two, three }


    void main() {


    //
    .name Ͱྻڍ໊ͷऔಘ
    ->
    "one"


    print(MyEnum.one.name);


    }


    / /
    .byName Ͱྻڍ஋ͷݕࡧ


    print(MyEnum.values.byName('two')
    ==
    MyEnum.two);


    / /
    .asNameMap Ͱ໊ͱ஋ͷ Map Λऔಘ


    final map = MyEnum.values.asNameMap();


    print(map['three']
    ==
    MyEnum.three);

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  56. ϥΠϒϥϦ։ൃ޲͚Ͱ pub ʹػೳ௥Ճ
    https://link.medium.com/kZTQCmukPlb
    1. ϦϦʔε࣌ʹҙਤ͠ͳ͍ Secrets ؚ͕·Εͯͳ͍͔νΣοΫ
    2. ޡͬͯϦϦʔεͨ͠΋ͷΛ pub.dev ͔ΒఫճͰ͖ΔΑ͏ʹ

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  57. ϦϦʔε࣌ʹҙਤ͠ͳ͍ Secrets ؚ͕·Εͯͳ͍͔νΣοΫ
    https://link.medium.com/kZTQCmukPlb
    Publishing my_package 1.0.0 to https://pub.dartlang.org:


    Package validation found the following errors:


    * line 1, column 1 of lib/key.pem: Potential leak of Private Key detected.





    1 │ ┌ - - -BEGIN PRIVATE KEY - - -


    2 │ │ H0M6xpM2q+53wmsN/eYLdgtjgBd3DBmHtPilCkiFICXyaA8z9LkJ


    3 │ └ - - -END PRIVATE KEY - - -





    * line 2, column 23 of lib/my_package.dart: Potential leak of Google OAuth Refresh Token detected.





    2 │
    fi
    nal refreshToken = "1//042ys8uoFwZrkCgYIARAAGAQSNwF-L9IrXmFYE-sfKefSpoCnyqEcsHX97Y90KY-
    p8TPYPPnY2IPgRXdy0QeVw7URuF5u9oUeIF0";
    false_secrets:


    - /lib/src/hardcoded_api_key.dart


    - /test/localhost_certi
    fi
    cates/*.pem
    ྫɿdart pub publish ࣌ͷνΣοΫ
    ςετσʔλͱͯ͠μϛʔΛஔ͍͍ͯΔ৔߹ͳͲ͸ pubspec.yaml ʹҎԼΛ௥Ճ

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  58. pub.dev ͰϦϦʔεΛఫճ
    https://link.medium.com/kZTQCmukPlb

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  59. DartPad

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  60. DartPad
    • React CodeSandbox ͷΑ͏ʹ Web ্Ͱ Dart ΍ Flutter
    ͷಈ࡞؀ڥΛ؆୯ʹ༻ҙͰ͖ΔʢCodeSandbox ΄ͲߴػೳͰ͸ͳ͍ʣ
    • Ұ෦ͷطʹ༻ҙ͞Ε͍ͯΔ༗໊ͳύοέʔδ΋ར༻͢Δ
    ͜ͱ͕Ͱ͖ΔʢFirebaseɺhttpɺriverpodɺFlutter Hooks ͳͲʣ

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  61. DartPad

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  62. Flutter ΞϓϦ։ൃͷࠓޙ
    ʹ޲͚ͯʢݸਓࢹ఺ʣ

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  63. Flutter ΞϓϦ։ൃͷࠓޙʹ޲͚ͯʢݸਓࢹ఺ʣ
    1. ΞϓϦͷΞʔΩςΫνϟ


    2. React ͔Βֶͼ͍ͨ͜ͱ


    2.1. React Hooks


    2.2. React ͷΞʔΩςΫνϟ

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  64. ΞϓϦͷΞʔΩςΫνϟ

    View Slide

  65. ΞϓϦͷΞʔΩςΫνϟ
    MVVM
    Bloc
    Redux
    ELM/MVU

    View Slide

  66. Android ΤϯδχΞʹ͸ೃ
    છΈͷਂ͍Ͱ͋Ζ͏
    MVVM + Repository Ͱ΋
    Flutter ͰͦΕ͕࠷దղͱ
    ͸ݶΒͳ͍
    View


    Repository


    ViewModel
    Local Source Remote Data Source
    MVVM
    Repository
    MVVM + Repository

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  67. ͜ͷϘλϯͷঢ়ଶ؅ཧ͸Ͳ͏͢Δʁ
    ςΩετϑΟʔϧυʹԿ͔
    ͕ೖྗ͞ΕΔ·ͰϘλϯ͸
    ඇ׆ੑʹ͍ͨ͠

    View Slide

  68. ViewModel Λ࡞ͬͯ؅ཧ͢Δʁ
    ίϯϙʔωϯτͷ୯ҐΛࡉ͔͘͢Ε
    ͹ͦͷ෼͚ͩରʹͳΔViewModel ΋
    ૿͑Δʁ
    ͜ͷϘλϯͷঢ়ଶ؅ཧ͸Ͳ͏͢Δʁ
    class ChatViewModel {


    String text = '';


    bool enabled = false;


    }
    class ChatWidget extends HookConsumerWidget {


    const ChatWidget({Key? key}) : super(key: key);


    @override


    Widget build(BuildContext context, WidgetRef ref) {


    final viewModel = ref.watch(chatViewModelProvider);


    return Column(


    children: [


    TextFormField(


    onChanged: (value) => viewModel.enabled = value.isNotEmpty,


    ),


    ElevatedButton(


    onPressed: viewModel.enabled ? () {/** Submit **/} : null,


    child: Text('Submit'),


    ),


    ],


    );


    }


    }

    View Slide

  69. ίϯϙʔωϯτ਺ ≒ ViewModel਺ʁ
    • XML ࣌୅ͷ Android ͩͱϨΠΞ΢τͷ୯Ґ͕େ͖͔ͬͨ


    • Flutter Ͱ͸Ͱ͖Δ͚ͩίϯϙʔωϯτΛখ͘͞׬݁ʹ࡞
    Γ͍ͨ


    • ϑΝΠϧ਺૿͑͗͢ΔͷͰίϯϙʔωϯτΛࡉ͔͘͢͠
    ͗ͳ͍Α͏ʹ͢Δ͔ʁʢͦͷԘക͕೉͍͠ʣ

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  70. class DetailViewModel {


    DetailData data;


    bool isLoading;


    String chatText = '';


    bool submitButtonEnabled = false;




    Future<> fetchData(){ }


    Future<> postData() { }


    }


    class ChatWidget extends HookConsumerWidget {


    const ChatWidget({Key? key}) : super(key: key);


    @override


    Widget build(BuildContext context, WidgetRef ref) {


    final viewModel =


    ref.watch(chatViewModelProvider);


    return ... // TextField, Button


    }


    }
    ChatWidget ͸ςΩετϑΟʔϧυͱϘλϯ͔͠ͳ͍ͷʹɺ
    ຊདྷ͢Δඞཁͷͳ͍΋ͷ·Ͱ·Ͱ஌Δ͜ͱ͕Ͱ͖ͯ͠·͏
    DetailViewModel ͸ ChatWidget Ͱ͸࢖
    Θͳ͍σʔλऔಘ΍ϩʔσΟϯάঢ়ଶͳ
    Ͳ΋΋͍ͬͯΔ
    ViewModel ͷൣғΛগ͠େ͖ͯ͘͠ΈΔʁ

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  71. ؆୯ͳঢ়ଶ͸ίϯϙʔωϯτଆͰ͍࣋ͪͨ ʴ ؆୯ʹॻ͖͍ͨ
    class CountPage extends StatefulWidget {


    @override


    State createState() => _CountState();


    }


    class _CountState extends State {


    int count = 0;


    @override


    void initState() { /** ॳظԽ **/ }


    @override


    void dispose() { /** ഁغ **/ }


    void setCount(int value) => setState(() => count = value);


    @override


    Widget build(BuildContext context) {


    return TextButton(


    child: Text(“Count: $count"),


    onPressed: () => setCount(count + 1),


    );


    }


    }
    Flutter Hooks Ͱॻ͘
    class CountPage extends HookWidget {


    @override


    Widget build(BuildContext context) {


    final count = useState(0);


    return TextButton(


    child: Text("Count: ${count.value}"),


    onPressed: () => count.value++,


    );


    }


    }


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  72. Flutter Hooks

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  73. LaunchedEffect(id) {


    //
    ID ͕มߋ͞ΕΔͨͼ


    }


    SideEffect {


    //
    ຖճ


    }


    LaunchedEffect(Unit) {


    //
    ࠷ॳͷҰճ


    }


    73
    useEffect
    useEffect(()
    =>
    {


    //
    ID ͕มߋ͞ΕΔͨͼ


    }, [id]);


    useEffect(()
    =>
    {


    //
    ຖճ


    });


    useEffect(()
    =>
    {


    //
    ࠷ॳͷҰճ


    }, const []);


    Flutter Hooks Jetpack Compose

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  74. ViewModel ͔ΒϘλϯͳͲͷঢ়ଶ؅ཧΛࠩ͠Ҿ͍͍ͯ͘ͱ
    ViewModel ͡Όͳ͍͍͔ͯ͘΋͠Εͳ͍





    MVVM ͡Όͳ͍͔΋…

    ʢ࣮ࡍʹ͸ଞʹ΋৭ʑΉͣᙱ͍ͱ͜Ζ͕͋Δʣ
    ΞʔΩςΫνϟΛߟ͑௚͢

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  75. ࠷ۙ͸ϨΠϠʔଟ͗͢Δ΋ͬͱݮΒ͍͖͍ͯͨ͠





    Flutter ΞϓϦք۾ͷઃܭ͕ఆ·ͬͯͳ͍͔ΒReact ͔ΒֶͿ͔
    ΞʔΩςΫνϟΛߟ͑௚͢

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  76. React ͔Βֶͼ͍ͨ͜ͱ

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  77. React ͔Βֶͼ͍ͨ͜ͱʢݸਓࢹ఺ʣ
    1. React App ͷΞʔΩςΫνϟ
    2. React Hooks ͷ࢖͍Ͳ͜Ζ
    3. ίϯϙʔωϯτ୯ҐͰͷςετ

    View Slide

  78. • Redux


    • Recoil


    • + React Query / SWR
    React App ͷΞʔΩςΫνϟ

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  79. • React Hook ࢖ͬͯσʔλऔಘ͢Δ
    ͨΊͷϥΠϒϥϦ


    • ίϯϙʔωϯτଆͰ API ͷωοτ
    ϫʔΫϦΫΤετΛ͢Δ


    • Ωϟογϡ΍ϦΫΤετͷॏෳഉ
    আͳͲ͸ϥΠϒϥϦଆ͕ߦ͏
    React Query / SWR
    import useSWR from 'swr'


    function Profile() {


    const { data, error } = useSWR('/api/user', fetcher)


    if (error) return failed to load


    if (!data) return loading...


    return hello {data.name}!


    }


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  80. • react-use ΍ react-hooks-testing-library ͔Β
    Ϣʔεέʔε΍ͦͷςετํ๏ͳͲΛֶΜͰ
    Flutter ք۾ʹ൓ө͢Δ
    React Hooks ͷ࢖͍Ͳ͜Ζ

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  81. react-use
    • ศརͳ Custom Hooks ͕ͨ͘͞Μؚ·Ε͍ͯΔ
    ϥΠϒϥϦ


    • npm i react-use ͯ͠࢖ͬͯ΋͍͍͠ɺ
    Unlicense ͳͷͰҰ෦Λίϐϖͯ͠࢖ͬͯ΋͍͍

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  82. react-use

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  83. import { useNetworkState } from 'react-use';


    const Demo = () => {


    const state = useNetworkState();


    return (





    {JSON.stringify(state, null, 2)}





    );


    };
    ྫ͑͹ useNetworkState Λ࢖͏ͱ୺
    ຤ͷωοτϫʔΫঢ়ଶΛ؂ࢹͯ͠ঢ়
    ଶ͕มΘͬͨΒϦϏϧυͯ͠஋Λऔ
    ಘͰ͖ΔΑ͏ʹ͢Δ
    react-use

    View Slide

  84. react-hooks-testing-library
    test('should increment counter', () => {


    const { result } = renderHook(() => useCounter())


    act(() => {


    result.current.increment()


    })


    expect(result.current.count).toBe(1)


    })


    ࣗ࡞ Hooks ͷςετΛॻ͘ʹ͸ίϯ
    ϙʔωϯτΛߋ৽͢ΔͨΊͷτϦ
    ΨʔΛॻ͍ͯ࠶ϨϯμϦϯάͤͨ͞
    Γɺ஋Λߋ৽͢ΔͨΊͷίʔυΛॻ
    ͍ͨΓ͠ͳ͚Ε͹͍͚ͳ͔ͬͨ΋ͷ
    Λ؆୯ʹ͔͚ΔΑ͏ʹ͢Δ

    View Slide

  85. react-hooks-testing-library
    testWidgets('debugFillProperties', (tester) async {


    await tester.pumpWidget(


    HookBuilder(builder: (context) {


    usePrevious(42);


    return const SizedBox();


    }),


    );


    await tester.pumpWidget(


    HookBuilder(builder: (context) {


    usePrevious(21);


    return const SizedBox();


    }),


    );


    final element = tester.element(find.byType(HookBuilder));


    expect(


    element


    .toDiagnosticsNode(style: DiagnosticsTreeStyle.offstage)


    .toStringDeep(),


    equalsIgnoringHashCodes(


    'HookBuilder\n'


    ' │ usePrevious: 42\n'


    ' └SizedBox(renderObject: RenderConstrainedBox#00000)\n',


    ),


    );


    });


    ࢀߟίʔυͱͯ͠ Flutter Hooks ͔Β
    ͖࣋ͬͯͨ usePrevious ͷςετίʔ
    υ͕ͪ͜ΒʹͳΓ·͢


    ᶃ Ͱ 42 Λ usePrevious ʹ౉͢


    ᶄ Ͱ 21 Λ usePrevious ʹ౉͢


    ᶅ Ͱ usePrevious ͷঢ়ଶΛ֬ೝ͢Δ





    View Slide

  86. react-hooks-testing-library
    testWidgets('debugFillProperties', (tester) async {


    final result = await buildHook(


    (value) => usePrevious(value),


    initialProps: 42,


    );


    await result.rebuild(21);


    expect(result.current, 42);


    });


    ΋͠Ծʹ Flutter Ͱಉ͡Α͏ͳ͜ͱ͕Ͱ͖
    ͨͱͨ͠Βɺ͜Ε͘Β͍ͷίʔυྔͰ͢


    react-hooks-testing-library ͸ͦΕ͘Β͍
    ϘΠϥʔίʔυΛ࡟ݮͰ͖ΔϥΠϒϥϦ



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  87. flutter_use ͱ flutter_hooks_testing

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  88. ·ͱΊ

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  89. ·ͱΊ
    • ΫϥΠΞϯταΠυ͕શͯએݴత UI ͷํ޲ʹͳͬͯ͘Ε͓ͨ
    ͔͛Ͱ Flutter Ͱ࡞Δʹͯ͠΋ React ͔Βֶ΂ͯ Jetpack
    Compose Ͱ࡞Δʹͯ͠΋ࢀߟʹͳΔ΋ͷ͕ΰϩΰϩͱస
    ͕͍ͬͯΔ
    • ֤ݴޠͷҧ͍ͳΜͯࠣࡉͳ΋ͷͰ UI ϑϨʔϜϫʔΫΛͦΕͧ
    ΕֶͿͷ͕େม͚ͩͬͨͲɺ༏͍͠ੈքʹͳ͖ͬͯͨ

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  90. Google Developers Expert
    @wasabeef_jp
    wasabeef
    CyberAgent, Inc.

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