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
NgRx Component Store
Search
Rainer Hahnekamp
July 20, 2022
Technology
1
110
NgRx Component Store
Slides for my talk on NgRx Component Store
Rainer Hahnekamp
July 20, 2022
Tweet
Share
More Decks by Rainer Hahnekamp
See All by Rainer Hahnekamp
Test Fest | Angular Unit Tests Distilled
rainerhahnekamp
0
370
Micro Frontends: Necessity, Implementation, and Challenges
rainerhahnekamp
2
810
Software richtig testen - Ganz praktisch!
rainerhahnekamp
0
98
Quality with Angular: Tools and Processes
rainerhahnekamp
0
360
Evolving Architecture
rainerhahnekamp
3
390
Microfrontends: Necessities - Implementations - Challenges
rainerhahnekamp
0
200
Zoneless Testing
rainerhahnekamp
0
230
Towards Modern Change Detection
rainerhahnekamp
0
46
Testing in 2024: A "dynamic" Situation
rainerhahnekamp
0
220
Other Decks in Technology
See All in Technology
ObsidianをLLM時代のナレッジベースに! クリッピング→Markdown→CLI連携の実践
srvhat09
7
8.8k
株式会社島津製作所_研究開発(集団協業と知的生産)の現場を支える、OSS知識基盤システムの導入
akahane92
1
1.1k
Bill One 開発エンジニア 紹介資料
sansan33
PRO
4
13k
Shadow DOMとセキュリティ - 光と影の境界を探る / Shibuya.XSS techtalk #13
masatokinugawa
0
270
Shadow DOM & Security - Exploring the boundary between light and shadow
masatokinugawa
0
650
ゼロから始めるSREの事業貢献 - 生成AI時代のSRE成長戦略と実践 / Starting SRE from Day One
shinyorke
PRO
0
230
MCP とマネージド PaaS で実現する大規模 AI アプリケーションの高速開発
nahokoxxx
1
1.4k
スプリントレビューを効果的にするために
miholovesq
9
1.6k
SRE with AI:実践から学ぶ、運用課題解決と未来への展望
yoshiiryo1
1
680
名刺メーカーDevグループ 紹介資料
sansan33
PRO
0
840
FAST導入1年間のふりかえり〜現実を直視し、さらなる進化を求めて〜 / Review of the first year of FAST implementation
wooootack
1
100
Talk to Someone At Delta Airlines™️ USA Contact Numbers
travelcarecenter
0
170
Featured
See All Featured
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.4k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
The Pragmatic Product Professional
lauravandoore
35
6.8k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
Testing 201, or: Great Expectations
jmmastey
43
7.6k
A Tale of Four Properties
chriscoyier
160
23k
Typedesign – Prime Four
hannesfritz
42
2.7k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
282
13k
Code Reviewing Like a Champion
maltzj
524
40k
Transcript
NgRx Component Store NgRx Component Store Rainer Hahnekamp 20.7.2022
About Me... • Rainer Hahnekamp ANGULARarchitects.io • Trainings and Consulting
@RainerHahnekamp Professional NgRx https://www.ng-news.com https://www.youtube.com /c/RainerHahnekamp
Agenda • NgRx Family • Theory • Selectors • Actions
• Effects • Miscellaneous
NgRx Family Store Effects Entity Data Router Store Store Devtools
Schematics ESLint Plugin Component Store Component
Main facts • (Little) sibling to @ngrx/store • Local /
component state management • State vanishes with component (by default) • Push-based • All logic included in single service
Use cases • Complicated, local state logic • Multiple instances
of same components • Different static logic (Decoupling, Shared) • ~Simplified, global state
API ComponentStore SideEffects Read Write select(): Observable patchState() setState() updater()
// like reducer effect()
Defining the state export interface HolidaysState { holidays: Holiday[]; favouriteIds:
number[]; } @Injectable() export class HolidaysStore extends ComponentStore<HolidaysState> { constructor(private httpClient: HttpClient, private config: Configuration) { super({ holidays: [], favouriteIds: [] }); } }
Selectors export interface HolidaysState { holidays: Holiday[]; favouriteIds: number[]; }
@Injectable() export class HolidaysStore extends ComponentStore<HolidaysState> { constructor(private httpClient: HttpClient, private config: Configuration) { super({ holidays: [], favouriteIds: [] }); } readonly holidays$ = this.select(({ holidays, favouriteIds }) => holidays.map((holiday) => ({ ...holiday, isFavourite: favouriteIds.includes(holiday.id), })) ); }
Using the ComponentStore @Component({ templateUrl: './holidays.component.html', standalone: true, imports: [...],
providers: [HolidaysStore], }) export class HolidaysComponent { holidays$ = this.holidaysStore.holidays$; constructor(private holidaysStore: HolidaysStore) { } }
Actions @Injectable() export class HolidaysStore extends ComponentStore<HolidaysState> { // ...
addFavourite(holidayId: number) { this.patchState((state) => ({ favouriteIds: [...state.favouriteIds, holidayId], })); } removeFavourite(holidayId: number) { this.patchState((state) => ({ favouriteIds: state.favouriteIds.filter((id) => id !== holidayId), })); } }
Using the ComponentStore @Component({ templateUrl: './holidays.component.html', standalone: true, imports: [...],
providers: [HolidaysStore], }) export class HolidaysComponent { holidays$ = this.holidaysStore.holidays$; constructor(private holidaysStore: HolidaysStore) { } addFavourite(id: number) { this.holidaysStore.addFavourite(id); } removeFavourite(id: number) { this.holidaysStore.removeFavourite(id); } }
Effects @Injectable() export class HolidaysStore extends ComponentStore<HolidaysState> { // ...
readonly load = this.effect((i$: Observable<void>) => { return i$.pipe( switchMap(() => this.httpClient.get<Holiday[]>(this.#baseUrl).pipe( tapResponse((holidays) => { const finalHolidays = holidays.map((holiday) => ({ ...holiday, imageUrl: `${this.config.baseUrl}${holiday.imageUrl}`, })); this.#setHolidays(finalHolidays); }, console.error) ) ) ); }); #setHolidays = (holidays: Holiday[]) => this.patchState({ holidays }); }
Using the ComponentStore @Component({ templateUrl: './holidays.component.html', standalone: true, imports: [...],
providers: [HolidaysStore], }) export class HolidaysComponent { holidays$ = this.holidaysStore.holidays$; constructor(private holidaysStore: HolidaysStore) { this.holidaysStore.load(); } addFavourite(id: number) { this.holidaysStore.addFavourite(id); } removeFavourite(id: number) { this.holidaysStore.removeFavourite(id); } }
Comparison to store • Same reactive behaviour • No devtools
• Scalability issues • Simpler • Nice goodies ◦ patchState ◦ Debounced selectors
Also keep in mind • Disposing of resources is built-in
• Combination with @ngrx/store possible • Can also manage global state ◦ via {providedIn: 'root'}
When to use? • Instead of services based on BehaviorSubject
• Non-global state • Early phases of application development
Alternatives Elf @rx-angular/state
Summary • Simple State Management • Reactive Behaviour • Easy
to upgrade to NgRx Store later
Further Reading/Watching • Original Design Document ◦ https://hackmd.io/zLKrFIadTMS2T6zCYGyHew?view • Official
Documentation ◦ https://ngrx.io/guide/component-store • Alex Okrushko on Component Store ◦ https://www.youtube.com/watch?v=v5WSUE1_YHM