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
Simplifying State by partially introducing unid...
Search
Benedikt Terhechte
October 13, 2017
Programming
3
930
Simplifying State by partially introducing unidirectional data flow in your codebase
Benedikt Terhechte
October 13, 2017
Tweet
Share
More Decks by Benedikt Terhechte
See All by Benedikt Terhechte
NSSpain 2023: An overview of different approaches to share code across platforms
terhechte
0
430
SwiftUI & UIKit, a match made in heaven or match made in hell?
terhechte
0
73
Learnings from building Design Systems at XING
terhechte
1
500
Introduction to Swift Keypaths
terhechte
15
20k
Sharing Code between iOS and Android with Rust
terhechte
8
2.4k
Protocols with Associated Types: When to use them and how to avoid their pitfalls
terhechte
2
270
Swift on the Server
terhechte
2
320
Macoun 2016 - Swift auf dem Server
terhechte
3
260
NSSpain 2016: Developing App-Backends with Swift on the Server
terhechte
2
23k
Other Decks in Programming
See All in Programming
PHP 8.4の新機能「プロパティフック」から学ぶオブジェクト指向設計とリスコフの置換原則
kentaroutakeda
2
900
PostgreSQLのRow Level SecurityをPHPのORMで扱う Eloquent vs Doctrine #phpcon #track2
77web
2
530
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
1
10k
なぜ適用するか、移行して理解するClean Architecture 〜構造を超えて設計を継承する〜 / Why Apply, Migrate and Understand Clean Architecture - Inherit Design Beyond Structure
seike460
PRO
3
770
『自分のデータだけ見せたい!』を叶える──Laravel × Casbin で複雑権限をスッキリ解きほぐす 25 分
akitotsukahara
2
640
Blazing Fast UI Development with Compose Hot Reload (droidcon New York 2025)
zsmb
1
290
AIプログラマーDevinは PHPerの夢を見るか?
shinyasaita
1
220
ruby.wasmで多人数リアルタイム通信ゲームを作ろう
lnit
3
480
イベントストーミング図からコードへの変換手順 / Procedure for Converting Event Storming Diagrams to Code
nrslib
2
820
A full stack side project webapp all in Kotlin (KotlinConf 2025)
dankim
0
120
猫と暮らす Google Nest Cam生活🐈 / WebRTC with Google Nest Cam
yutailang0119
0
120
Modern Angular with Signals and Signal Store:New Rules for Your Architecture @enterJS Advanced Angular Day 2025
manfredsteyer
PRO
0
220
Featured
See All Featured
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
357
30k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
Optimizing for Happiness
mojombo
379
70k
Embracing the Ebb and Flow
colly
86
4.7k
Rails Girls Zürich Keynote
gr2m
95
14k
Typedesign – Prime Four
hannesfritz
42
2.7k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
126
53k
The Invisible Side of Design
smashingmag
301
51k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.4k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
29
9.6k
Code Reviewing Like a Champion
maltzj
524
40k
Transcript
1
2
3
4
5
6
7
8
9
None
10
11
12
13
14
None
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
/// Model struct Cinnamon { let value: Int = 0
} enum Event { case increase } 45
/// Model struct Cinnamon { let value: Int = 0
} enum Event { case increase } func reducer(state: Cinnamon, event: Event) -> Cinnamon { var newState = state if event == .increase { newState.value += 1 } return newState } /// UI let builder = Form(state: Cinnamon(), reducer: reducer) 46
47
48
49
struct AddressBook { var contacts: [Person] var searchTerm: String var
scrollPosition: Int } 50
struct AddressBookApp { struct Data { var contacts: [Person] }
var data: Data struct UI { var searchTerm: String var scrollPosition: Int } var ui: UI } 51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
private var subscribers: [String: (State)->Void] = [:] public func subscribe(_
subscriber: @escaping (State)->Void) -> String { let token = UUID().uuidString subscribers[token] = subscriber subscriber(state) return token } 66
67
protocol FormComponent { associatedtype State func setup(with state: State) func
update(state: State) -> Void } public func subscribe<Component: FormComponent> (_ subscriber: Component) -> String where Component.State == State {... 68
69
func subscribe<Type: Equatable>( path: KeyPath<Data, Type>, action: @escaping (_ oldValue:
Type, _ newValue: Type) -> Void ) -> String struct Person { let name: String } form.subscribe(path: \Person.name) { (old, new) in ... } 70
private var history: [State] = [] func apply(_ change: (inout
State) -> Void) { states.append(state) change(&state) notifySubscribers() } func undo() { state = history.popLast() notifySubscribers() } 71
72
73
74
75
76
77
78
79
80