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
950
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
Back to the Future: Let me tell you about the ACP protocol
terhechte
0
150
NSSpain 2023: An overview of different approaches to share code across platforms
terhechte
0
450
Dependency Management with Swift
terhechte
0
4
NSSpain 2020: GeometryReader, View Preferences and Anchors - SwiftUI tales from the Hyperdeck
terhechte
0
4
FrenchKit 2020: Hyperdeck. What can go wrong on a multiyear side project
terhechte
0
2
SwiftUI & UIKit, a match made in heaven or match made in hell?
terhechte
0
74
Learnings from building Design Systems at XING
terhechte
1
520
Introduction to Swift Keypaths
terhechte
15
20k
Sharing Code between iOS and Android with Rust
terhechte
8
2.4k
Other Decks in Programming
See All in Programming
CSC509 Lecture 05
javiergs
PRO
0
310
One Enishi After Another
snoozer05
PRO
0
130
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
450
Things You Thought You Didn’t Need To Care About That Have a Big Impact On Your Job
hollycummins
0
240
All About Angular's New Signal Forms
manfredsteyer
PRO
0
200
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
220
Domain-centric? Why Hexagonal, Onion, and Clean Architecture Are Answers to the Wrong Question
olivergierke
3
930
contribution to astral-sh/uv
shunsock
0
220
Claude Agent SDK を使ってみよう
hyshu
0
1.3k
Foundation Modelsを実装日本語学習アプリを作ってみた!
hypebeans
0
120
EMこそClaude Codeでコード調査しよう
shibayu36
0
260
大規模アプリのDIフレームワーク刷新戦略 ~過去最大規模の並行開発を止めずにアプリ全体に導入するまで~
mot_techtalk
1
470
Featured
See All Featured
Bash Introduction
62gerente
615
210k
Git: the NoSQL Database
bkeepers
PRO
431
66k
The World Runs on Bad Software
bkeepers
PRO
72
11k
Unsuck your backbone
ammeep
671
58k
KATA
mclloyd
PRO
32
15k
Agile that works and the tools we love
rasmusluckow
331
21k
How to Ace a Technical Interview
jacobian
280
24k
BBQ
matthewcrist
89
9.8k
Six Lessons from altMBA
skipperchong
29
4k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
657
61k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
34
2.5k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.9k
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