Swiftのmapからその次へ

Transcript

1. Swiftͷmap͔Βͦͷ࣍ ΁ 2016/08/04 oyuk(@oydku)
2. ࣗݾ঺հ • oyuk(@oydku) • iosΞϓϦΤϯδχΞ!
3. Swiftͷmap map͕࢖͑Δ΍ͭΒ͍͔ͭ͋͘ΔΑͶ • Optional (Enum) • Array (CollectionType) • ObservableType (RxSwift) ଞʹ͔͋ͬͨ΋Ͷɻ͋ͬͨΒڭ͑ͯ
4. mapͷఆٛΛݟΔ Optional func map<U>(@noescape f: (Wrapped) throws -> U) rethrows -> U? Array func map<T>(@noescape transform: (Self.Generator.Element) throws -> T) rethrows -> [T] ObservableType public func map<R>(selector: Self.E throws -> R) -> RxSwift.Observable<R>
5. ڞ௨఺͋ΔΑͶ!
6. ͍͍ͩͨ͜Μͳײ͡ func map<U>(f:T -> U) -> ͋Δ෺<U>
7. ͍͍ͩͨ͜Μͳײ͡ func map<U>(f:T -> U) -> ͋Δ෺<U> Optional func map<U>(@noescape f: (Wrapped) throws -> U) rethrows -> U? • Wrapped->Uͷؔ਺ΛWrappedʹద༻ͯ͠U?Λฦ͢ • ͋Δ෺<U>͸͜͜Ͱ͸U?
8. ͍͍ͩͨ͜Μͳײ͡ func map<U>(f:T -> U) -> ͋Δ෺<U> Array func map<T>(@noescape transform: (Self.Generator.Element) throws -> T) rethrows -> [T] • Self.Generator.Element->Tͷؔ਺Λ Self.Generator.Elementʹద༻ͯ͠[T]Λฦ͢ • ͋Δ෺<U>͸͜͜Ͱ͸[U]
9. ͍͍ͩͨ͜Μͳײ͡ func map<U>(f:T -> U) -> ͋Δ෺<U> ObservableType public func map<R>(selector: Self.E throws -> R) -> RxSwift.Observable<R> • Self.E->Rͷؔ਺ΛSelf.Eʹద༻ͯ͠ RxSwift.Observable<R>Λฦ͢ • ͋Δ෺<U>͸͜͜Ͱ͸RxSwift.Observable<R>
10. Μʁ
11. Ͳͷmap΋ಉ͡ʢ͖ͬ͞ݴͬͨʣ func map<U>(f:T -> U) -> ͋Δ෺<U> • ͋Δ෺<T>ʹؔ਺(T->U)Λద༻ͯ͋͠Δ෺<U>Λฦ͢
12. ۩ମతʹ func map<String>(f:Int -> String) -> Optional<String> Optional let o:Optional<String> = Optional<Int>(1).map{String($0)}
13. ۩ମతʹ func map<String>(f:Int -> String) -> Array<String> Array let a:Array<String> = Array(arrayLiteral: 1,2,3).map {String($0)}
14. ۩ମతʹ func map<String>(f:Int -> String) -> Observable<String> ObservableType let o:Observable<String> = Observable.just(1).map{String($0)}
15. ΈΜͳಉͩ͡Ͷʢ͖ͬ͞ݴͬͨʣ let a:͋Δ෺<U> = ͋Δ෺<T>.map{U($0)} • ͋Δ෺͕ • Optional • Array • Observable ʹͳΔΘ͚Ͱ͢ͳ
16. ͋Δ෺ͬͯԿʁ
17. Functor • શମΛҠͤΔ΋ͷΛද͢ • ؔखͱ͍͏Β͍͠ • ശʹྫ͑ΒΕΔࣄ͕͋Δ Πϝʔδ let a:Functor<U> = Functor<T>.map{U($0)}
18. Functor let o:Optional<String> = Optional<Int>(1).map{String($0)} map͕͍ͯ͠Δ͜ͱ͸ 1. Optional<Int>ͱ͍͏ശͷத਎ΛऔΓग़͠ɺ͜ΕΛ$0ͱ͢ Δɻ 2. $0ΛStringʹΩϟετ 3. $0ΛOptional<String>ͱ͍͏ശʹೖΕͯฦ͢
19. Functor let a:Array<String> = Array(arrayLiteral: 1,2,3).map {String($0)} map͕͍ͯ͠Δ͜ͱ͸ 1. Array<Int>ͱ͍͏ശͷத਎ΛऔΓग़͠ɺ͜ΕΛ$0ͱ͢Δɻ 2. $0ʢ֤ཁૉʣΛStringʹΩϟετ 3. $0ΛArray<String>ͱ͍͏ശʹೖΕͯฦ͢
20. Functor let o:Observable<String> = Observable.just(1).map{String($0)} map͕͍ͯ͠Δ͜ͱ͸ 1. Observable<Int>ͱ͍͏ശͷத਎ΛऔΓग़͠ɺ͜ΕΛ$0ͱ͢ Δɻ 2. $0ΛStringʹΩϟετ 3. $0ΛObservable<String>ͱ͍͏ശʹೖΕͯฦ͢
21. ·ͱΊ • mapͷഎޙʹ͸Functorͱ͍͏֓೦͕͋Δ • Functor͸શମΛҠͤΔ෺Λ͋ΒΘ͢ • ࠓճͷྫͰ͸Optional,Array,Observable • શମΛҠ͢ಈ࡞͕mapͰ͋Δ