エラーと警告で
コードをデザインする
~赤と黄の輪舞曲~

Transcript

1. 1.

   έϮ⑲ͺ๱ຓ͹
 θ⑲ώΤόλΩϸͫΝ
 _᧬ͺԫ΀ᇷዛູ_ 2016/8/20 ezura

2. 2.

   FSSPS
   ΁͜ṽ͟͹ͫ͝Ħ

3. 3.

   XBSOJOH
   ΁͜ṽ͟͹ͫ͝Ħ

4. 4.

   None
5. 5.

   None
6. 6.

   None
7. 7.

   Δͩ׎͘ͼΛj

8. 8.

   Δ͵ͺ᪇͡ ཱͺᲇձ͖ͱ͝͵ͱj

9. 9.

   ဒᘥ ࣮ḝ ᙉණ

10. 10.

    ͹͟ΝĈ ᦉᷯΔ͔Ν

11. 11.

    ࣮ḝ᧸ͽុΜΤ᧬ͺԫᓸ͹
 ᓸ᏶ͣ͸ΑΐͩΙ͘

12. 12.

    έϮ⑲ͺ๱ຓ͹
 θ⑲ώΤόλΩϸͫΝ
 _᧬ͺԫ΀ᇷዛູ_

13. 13.

    ↟1IBOUPN
    5ZQF
    ↟%FDMBSBUJPO
    "UUSJCVUFT

14. 14.

    $BTF
    

15. 15.

    class HogeOperation { /// Ұ౓͚ͩݺͿ͜ͱ func prepare() /// prepare ޙ͔Β࢖͑Δ

    func execute() /// ͍ͭݺΜͰ΋ྑ͍ func mob() }
16. 16.

    /// Ұ౓͚ͩݺͿ͜ͱ
 /// prepare ޙ͔Β࢖͑Δ

17. 17.

    private var isPrepared = false /// Ұ౓͚ͩݺͿ͜ͱ func prepare() {

    guard !isPrepared else {
 fatalError("prepare() Λෳ਺ݺ͹ͳ͍͜ͱ") } isPrepared = true }
18. 18.

    None
19. 19.

    None
20. 20.

    όλΩϸͩΚ͘Ĉ

21. 21.

    1IBOUPN
    5ZQF ܕ৘ใΛར༻ͯ͠ॲཧͷޡΓΛࢦఠՄೳʹ

22. 22.

    ᴰᨷ΀ঢ়Ừ͹΀Α
 ᑿᠭ൱ၙͼϦςψώΤᨷᤅ

23. 23.

    protocol OperationState {} class Init: OperationState {} class Prepared: OperationState

    {}
24. 24.

    class HogeOperation<State: OperationState> {}

25. 25.

    extension HogeOperation where State: Init { /// Ұ౓͚ͩݺͿ͜ͱ func prepared()

    -> HogeOperation<Prepared> { let readyOp = HogeOperation<Prepared>() 
 // TODO: ඞཁͳσʔλΛҾ͖ܧ͗ return readyOp } }
26. 26.

    θϸϖΩϰέϮ⑲
    
    ỹ኷
    
    ỹ኷

27. 27.

    None
28. 28.

    extension HogeOperation where State: Prepared { /// prepare ΛݺΜͩޙ͔Β࢖༻Մೳ func

    execute() { /* do somethig */ } }
29. 29.

    θϸϖΩϰέϮ⑲
    

30. 30.

    ଓ͟΁
    8FC
    ͹ https://gist.github.com/ezura/ f5aebef7bb86edbfd40b0bd1d0435e00

31. 31.

    1IBOUPN
    5ZQF
    ͖Ο͖Ο ↟ 'VODUJPOBM
    4OJQQFU
    
    1IBOUPN
    5ZQFT
    ↟ 4XJGU
    .POFZ
    XJUI
    1IBOUPN
    5ZQFT
    ↟ 4XJGU
    ͹
    1IBOUPN
    5ZQF
    ᢮ྶṞ
    ↟

    1IBOUPN
    5ZQF͹θϸϖΩϰᙉͽঢ়ᴋφάψδͫΝ
    TIJCVZBTXJGU
     ↑ ঢ়ଶભҠΛ៉ྷʹදݱ͍ͯͯ͠௒ײಈ
32. 32.

    $BTF
    

33. 33.

    /// ୅ΘΓʹ fuga Λ࢖͏͜ͱʂ func hoge() { … }

34. 34.

    όλΩϸͩΚ͘Ĉ

35. 35.

    %FDMBSBUJPO
    "UUSJCVUFT ৘ใΛ෇༩

36. 36.

    /// ୅ΘΓʹ fuga() Λ࢖͏͜ͱʂ @available(*, unavailable,
 message="͓໾ޚ໔͞…(ƅωƅ)",
 renamed="fuga") func hoge()

    { … }
37. 37.

    /// ୅ΘΓʹ fuga() Λ࢖͏͜ͱʂ @available(*, unavailable,
 message="͓໾ޚ໔͞…(ƅωƅ)",
 renamed="fuga") func hoge()

    { … }
38. 38.

    /// ୅ΘΓʹ fuga() Λ࢖͏͜ͱʂ @available(iOS, deprecated=1,
 message="͓໾ޚ໔͞…(ƅωƅ)",
 renamed="fuga") func hoge()

    { … }
39. 39.

    ᬋණ ↟ !BWBJMBCMF
    ↟ !EJTDBSEBCMF3FTVMU
    4XJGU
    ͝Λ
    ↟ !XBSO@VOVTFE@SFTVMU
    4XJGU
    ͹ഇᬬ

    ஫: Swift3 ͔ΒҰ෦࢓༷͕มߋ͞Ε·͢
40. 40.

    ᓸ᏶ͣ͸
 ͖ͣͯ͘͹ͫ͝Ħ

41. 41.

    ͦਗ਼ௌ͔Μ͞ͺ͖ͦͨ͘ΐͩͱĈ