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関数を引数として渡す書き方のポイント
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Yoshikuni Kato
September 17, 2017
Programming
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700
関数を引数として渡す書き方のポイント
iOSDC LT
https://iosdc.jp/2017/node/1454
Yoshikuni Kato
September 17, 2017
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Transcript
ؔΛҾͱͯ͢͠ॻ͖ํͷϙΠϯτ Ճ౻༝܇ / @yoshikuni_kato iOSDC 2017 2017/09/17 1
Who am I? • Ճ౻༝܇ʢYoshikuni Katoʣ @yoshikuni_kato • iOSΤϯδχΞʢ2.5 yearsʣ
• Yahoo! Japan -> Φϋί • ʮϥδ͐ʯ͘Μ → • Interests: ઃܭ / FRP / Coordinator PaFern / UI࣮ 2
func%onalʹॻ͘ • func&onalʹॻ͘͜ͱ͕૿͖͑ͯͨ • FRP (RxSwi3 / Reac&veSwi3) • map
/ filter / reduce • iffor͕ݮΔ • એݴతʹॻ͚Δ 3
͜ͷLTͰγΣΞ͢Δ͜ͱ • ؔΛҾͱͯ͢͠߹ͷॻ͖ํ → গ͠ͷมߋ͚ͩͲɺΑΓએݴతʹݟ͑Δํ๏ • arrayͷmapΛྫʹ 4
ॻ͖ํ̍ - ΫϩʔδϟΛॻ͘ let array: [Int] = [1, 2, 3]
array.map { number -> Int in return number * 2 } 5
arrayͷmapͷఆٛ func map<T>(_ transform: (Element) throws -> T) rethrows ->
[T] • mapͷҾɿElementΛड͚औͬͯTΛฦ͢Ϋϩʔδϟ • ؔɺ໊લ͖ͷΫϩʔδϟͱଊ͑ΒΕΔ • ؔࣗମΛ͢͜ͱ͕Ͱ͖Δ 6
ॻ͖ํ̎ - ؔΛ͢ // ઌʹؔΛఆٛ func twoTimes(of number: Int) ->
Int { return number * 2 } let array: [Int] = [1, 2, 3] array.map(twoTimes) // ؔΛ͢ 7
ύϥϝʔλʔ͕ෳ͋Δ߹ func someFunc(a: Int, b: Int) -> String { return
"a = \(a), b = \(b)" } let array: [Int] = [1, 2, 3] array .map { number -> (a: Int, b: Int) in return (a: number, b: number) // Ұ୴λϓϧʹ͢Δ } .map(someFunc) 8
ΠχγϟϥΠβͷ߹ struct Sample { let number: Int init(number: Int) {
self.number = number } } 9
ॻ͖ํ̍ - ΫϩʔδϟΛॻ͘ let array: [Int] = [1, 2, 3]
array.map { number -> Sample in return Sample(number: number) } 10
ॻ͖ํ̎ - ؔΛ͢ let array: [Int] = [1, 2, 3]
array.map(Sample.init) • ΠχγϟϥΠβ(.init) = ͦͷObjectΛฦؔ͢ 11
ҧ͍ 1 array.map { number -> Sample in return Sample(number:
number) } array.map(Sample.init) 12
ҧ͍ 2 array .map { number -> Int in return
number * 2 } .map { number -> Sample in return Sample(number: number) } .map { sample -> Foo in return Foo(sample: sample) } array .map(twoTimes) .map(Sample.init) .map(Foo.init) 13
·ͱΊ • গ͠ॻ͖ํΛม͑Δ͚ͩͰɺΑΓએݴతʹॻ͚Δํ๏Λհ • ׆༻ྫɿModel͔ΒViewModelͷม ɹ model.map(ViewModel.init) • ݁ՌతʹɺॲཧΛؔʹΓग़͍ͯ͘͜͠ͱʹͳΔ •
ؔΛ͍ͯ͘͠ײ֮ʢखଓ͖ܕͷײ͔֮ΒঃʑʹΕΔʣ 14
ࢀߟ • Connec'ng View Controllers, Swi3 Talk1 • From Run'me
Programming to Func'ons, Swi3 Talk2 2 h$ps:/ /talk.objc.io/episodes/S01E19-from-run@me-programming-to-func@ons 1 h$ps:/ /talk.objc.io/episodes/S01E05-connec;ng-view-controllers 15
͓·͚ func someFunc(a: Int, b: Int) -> String { return
"a: \(a), b: \(b)" } // λϓϧͤͳ͍ let parameters = (a: 0, b: 0) someFunc(parameters) // !ʢswift3~ʣ // mapͩͱͤΔ let array: [(Int, Int)] = [(0, 0)] array.map(someFunc) // "ʢswift3Ͱʣ • ͳͥॻ͚Δͷ͔͔͍ͬͯΔਓ͕͍ͨΒڭ͍͑ͯͩ͘͞ 16