Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
関数を引数として渡す書き方のポイント
Search
Yoshikuni Kato
September 17, 2017
Programming
0
780
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
Tweet
Share
More Decks by Yoshikuni Kato
See All by Yoshikuni Kato
The Elm Architecture & Swift
yoching
0
920
iOS developers community in Tokyo
yoching
0
670
Swiftエンジニアが海外のポジションに応募する
yoching
10
2.9k
App Architecture By Manual DI
yoching
0
660
Passing function to function arguments
yoching
0
650
「新規アプリの設計」を設計する
yoching
1
1.8k
App Architecture By Manual DI
yoching
2
550
App Architecture Sample
yoching
0
93
San Francisco Report
yoching
0
670
Other Decks in Programming
See All in Programming
CSS Linter による Baseline サポートの仕組み
ryo_manba
1
160
GoとPHPのインターフェイスの違い
shimabox
2
210
複数のAWSアカウントから横断で 利用する Lambda Authorizer の作り方
tc3jp
0
120
『テスト書いた方が開発が早いじゃん』を解き明かす #phpcon_nagoya
o0h
PRO
9
2.5k
良いコードレビューとは
danimal141
7
2k
クリーンアーキテクチャから見る依存の向きの大切さ
shimabox
5
1.1k
Rubyで始める関数型ドメインモデリング
shogo_tksk
0
140
Introduction to kotlinx.rpc
arawn
0
770
React 19アップデートのために必要なこと
uhyo
8
1.5k
Django NinjaによるAPI開発の効率化とリプレースの実践
kashewnuts
1
280
お前もAI鬼にならないか?👹Bolt & Cursor & Supabase & Vercelで人間をやめるぞ、ジョジョー!👺
taishiyade
7
4.2k
DRFを少しずつ オニオンアーキテクチャに寄せていく DjangoCongress JP 2025
nealle
2
280
Featured
See All Featured
Fireside Chat
paigeccino
35
3.2k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
160
15k
Statistics for Hackers
jakevdp
797
220k
Visualization
eitanlees
146
15k
A better future with KSS
kneath
238
17k
Fashionably flexible responsive web design (full day workshop)
malarkey
406
66k
Intergalactic Javascript Robots from Outer Space
tanoku
270
27k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
10
520
The Cult of Friendly URLs
andyhume
78
6.2k
Building Your Own Lightsaber
phodgson
104
6.2k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
Designing on Purpose - Digital PM Summit 2013
jponch
117
7.1k
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