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
870
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
390
SwiftUI & UIKit, a match made in heaven or match made in hell?
terhechte
0
57
Learnings from building Design Systems at XING
terhechte
1
460
Introduction to Swift Keypaths
terhechte
15
20k
Sharing Code between iOS and Android with Rust
terhechte
8
2.3k
Protocols with Associated Types: When to use them and how to avoid their pitfalls
terhechte
2
260
Swift on the Server
terhechte
2
300
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
Запуск 1С:УХ в крупном энтерпрайзе: мечта и реальность ПМа
lamodatech
0
960
BEエンジニアがFEの業務をできるようになるまでにやったこと
yoshida_ryushin
0
210
asdf-ecspresso作って 友達が増えた話 / Fujiwara Tech Conference 2025
koluku
0
1.4k
GitHub CopilotでTypeScriptの コード生成するワザップ
starfish719
26
6k
混沌とした例外処理とエラー監視に秩序をもたらす
morihirok
14
2.4k
Alba: Why, How and What's So Interesting
okuramasafumi
0
220
.NETでOBS Studio操作してみたけど…… / Operating OBS Studio by .NET
skasweb
0
120
PHPで学ぶプログラミングの教訓 / Lessons in Programming Learned through PHP
nrslib
4
1.1k
毎日13時間もかかるバッチ処理をたった3日で60%短縮するためにやったこと
sho_ssk_
1
560
自動で //nolint を挿入する取り組み / Gopher's Gathering
utgwkk
1
110
php-conference-japan-2024
tasuku43
0
440
アクターシステムに頼らずEvent Sourcingする方法について
j5ik2o
6
710
Featured
See All Featured
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
47
5.1k
Practical Orchestrator
shlominoach
186
10k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
49
2.2k
Measuring & Analyzing Core Web Vitals
bluesmoon
5
210
How GitHub (no longer) Works
holman
312
140k
Designing for humans not robots
tammielis
250
25k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
4
180
Building Applications with DynamoDB
mza
93
6.2k
Statistics for Hackers
jakevdp
797
220k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
30
2.1k
Documentation Writing (for coders)
carmenintech
67
4.5k
Rebuilding a faster, lazier Slack
samanthasiow
79
8.8k
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