Swiftのmapからその次へ

Transcript

1. Swiftͷmap͔Βͦͷ࣍
   ΁
   2016/08/04
   oyuk(@oydku)
   

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2. ࣗݾ঺հ
   • oyuk(@oydku)
   • iosΞϓϦΤϯδχΞ!
   

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3. Swiftͷmap
   map͕࢖͑Δ΍ͭΒ͍͔ͭ͋͘ΔΑͶ
   • Optional (Enum)
   • Array (CollectionType)
   • ObservableType (RxSwift)
   ଞʹ͔͋ͬͨ΋Ͷɻ͋ͬͨΒڭ͑ͯ
   

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4. mapͷఆٛΛݟΔ
   Optional
   func map(@noescape f: (Wrapped) throws -> U) rethrows -> U?
   Array
   func map(@noescape transform: (Self.Generator.Element) throws -> T) rethrows -> [T]
   ObservableType
   public func map(selector: Self.E throws -> R) -> RxSwift.Observable
   

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5. ڞ௨఺͋ΔΑͶ!
   

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6. ͍͍ͩͨ͜Μͳײ͡
   func map(f:T -> U) -> ͋Δ෺
   

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7. ͍͍ͩͨ͜Μͳײ͡
   func map(f:T -> U) -> ͋Δ෺
   Optional
   func map(@noescape f: (Wrapped) throws -> U) rethrows -> U?
   • Wrapped->Uͷؔ਺ΛWrappedʹద༻ͯ͠U?Λฦ͢
   • ͋Δ෺͸͜͜Ͱ͸U?
   

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8. ͍͍ͩͨ͜Μͳײ͡
   func map(f:T -> U) -> ͋Δ෺
   Array
   func map(@noescape transform: (Self.Generator.Element) throws -> T) rethrows -> [T]
   • Self.Generator.Element->Tͷؔ਺Λ
   Self.Generator.Elementʹద༻ͯ͠[T]Λฦ͢
   • ͋Δ෺͸͜͜Ͱ͸[U]
   

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9. ͍͍ͩͨ͜Μͳײ͡
   func map(f:T -> U) -> ͋Δ෺
   ObservableType
   public func map(selector: Self.E throws -> R) -> RxSwift.Observable
   • Self.E->Rͷؔ਺ΛSelf.Eʹద༻ͯ͠
   RxSwift.ObservableΛฦ͢
   • ͋Δ෺͸͜͜Ͱ͸RxSwift.Observable
   

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10. Μʁ
    

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11. Ͳͷmap΋ಉ͡ʢ͖ͬ͞ݴͬͨʣ
    func map(f:T -> U) -> ͋Δ෺
    • ͋Δ෺ʹؔ਺(T->U)Λద༻ͯ͋͠Δ෺Λฦ͢
    

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12. ۩ମతʹ
    func map(f:Int -> String) -> Optional
    Optional
    let o:Optional = Optional(1).map{String($0)}
    

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13. ۩ମతʹ
    func map(f:Int -> String) -> Array
    Array
    let a:Array = Array(arrayLiteral: 1,2,3).map {String($0)}
    

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14. ۩ମతʹ
    func map(f:Int -> String) -> Observable
    ObservableType
    let o:Observable = Observable.just(1).map{String($0)}
    

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15. ΈΜͳಉͩ͡Ͷʢ͖ͬ͞ݴͬͨʣ
    let a:͋Δ෺ = ͋Δ෺.map{U($0)}
    • ͋Δ෺͕
    • Optional
    • Array
    • Observable
    ʹͳΔΘ͚Ͱ͢ͳ
    

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16. ͋Δ෺ͬͯԿʁ
    

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17. Functor
    • શମΛҠͤΔ΋ͷΛද͢
    • ؔखͱ͍͏Β͍͠
    • ശʹྫ͑ΒΕΔࣄ͕͋Δ
    Πϝʔδ
    let a:Functor = Functor.map{U($0)}
    

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18. Functor
    let o:Optional = Optional(1).map{String($0)}
    map͕͍ͯ͠Δ͜ͱ͸
    1. Optionalͱ͍͏ശͷத਎ΛऔΓग़͠ɺ͜ΕΛ$0ͱ͢
    Δɻ
    2. $0ΛStringʹΩϟετ
    3. $0ΛOptionalͱ͍͏ശʹೖΕͯฦ͢
    

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19. Functor
    let a:Array = Array(arrayLiteral: 1,2,3).map {String($0)}
    map͕͍ͯ͠Δ͜ͱ͸
    1. Arrayͱ͍͏ശͷத਎ΛऔΓग़͠ɺ͜ΕΛ$0ͱ͢Δɻ
    2. $0ʢ֤ཁૉʣΛStringʹΩϟετ
    3. $0ΛArrayͱ͍͏ശʹೖΕͯฦ͢
    

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20. Functor
    let o:Observable = Observable.just(1).map{String($0)}
    map͕͍ͯ͠Δ͜ͱ͸
    1. Observableͱ͍͏ശͷத਎ΛऔΓग़͠ɺ͜ΕΛ$0ͱ͢
    Δɻ
    2. $0ΛStringʹΩϟετ
    3. $0ΛObservableͱ͍͏ശʹೖΕͯฦ͢
    

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21. ·ͱΊ
    • mapͷഎޙʹ͸Functorͱ͍͏֓೦͕͋Δ
    • Functor͸શମΛҠͤΔ෺Λ͋ΒΘ͢
    • ࠓճͷྫͰ͸Optional,Array,Observable
    • શମΛҠ͢ಈ࡞͕mapͰ͋Δ
    

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