Modern State Management in Angular: 3+n Flavors of the Signal Store @ijs London 2024

@ManfredSteyer ManfredSteyer Modern State Management in Angular 3+n Flavors of
the Signal Store

@ManfredSteyer Signal as Producer 4711 Consumer read set notify 4712

@ManfredSteyer Signal Eventually Zone-less!

@ManfredSteyer flights = signal<Flight[]>([]); const flights = await this.flightService.findAsPromise(from, to);
this.flights.set(flights); <div *ngFor="let f of flights()"> <flight-card [item]="f" /> </div>

@ManfredSteyer from = signal('Paris'); to = signal('London'); flightRoute = computed(()
=> this.from() + ' to ' + this.to()); constructor() { effect(() => { console.log('from', this.from()); console.log('to', this.to()); }); }

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@ManfredSteyer Component Store "Intention" Signals sync/ async computed(…) computed(…)

@ManfredSteyer

@ManfredSteyer Manfred Steyer

@ManfredSteyer

@ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { private
state = signalState({ from: 'Paris', to: 'London', flights: [] as Flight[], basket: {} as Record<number, boolean>, }); readonly flights = this.state.flights; readonly from = this.state.from; […] }

@ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […]
readonly selected = computed( () => this.flights().filter((f) => this.basket()[f.id]) ); […] }

updateCriteria(from: string, to: string): void { patchState(this.state, { from, to }) } […] }

updateCriteria(from: string, to: string): void { patchState(this.state, (state) => ({ from: state.to, to: state.from })); } […] }

@ManfredSteyer

@ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' },
[…] );

withState({ from: 'Paris', to: 'London', […] }), […] );

withState({ from: 'Paris', to: 'London', […] }), withComputed(([…]) => ({ […] })), withMethods(([…]) => ({ })), withHooks({ […] }) );

@ManfredSteyer

@ManfredSteyer export const FlightBookingStore = signalStore( […] withMethods((state) => {
[…] return { connectCriteria: rxMethod<Criteria>((c$) => c$.pipe([…])) }; }), […] );

@ManfredSteyer export const FlightBookingStore = signalStore( […] withMethods((state) => {
[…] return { connectCriteria: rxMethod<Criteria>((c$) => c$.pipe( filter(c => c.from.length >= 3 && c.to.length >= 3), debounceTime(300), switchMap((c) => flightService.find(c.from, c.to)), tap(flights => patchState(state, { flights })) )) }; }), […] );

@ManfredSteyer export const FlightBookingStore = signalStore( […] withHooks({ onInit({ connectCriteria,
criteria }) { connectCriteria(criteria); }, }), ); takes: Signal<T>, Observable<T>, T

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@ManfredSteyer const BookingStore = signalStore( withEntities<FlightState>() );

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@ManfredSteyer Michael Egger-Zikes Rainer Hahnekamp Manfred Steyer

@ManfredSteyer Free eBook (6th Edition) ANGULARarchitects.io/book 20 Chapters 4 new
Signal Store Chapters

@ManfredSteyer Signals: Future of CD Take Care of Data Flow
Stores are the Missing Link Signal Store Lightweight Highly Extensible

@ManfredSteyer

@ManfredSteyer d Slides & Examples Remote Company Workshops and Consulting
http://angulararchitects.io

Modern State Management in Angular: 3+n Flavors...

Modern State Management in Angular: 3+n Flavors of the Signal Store @ijs London 2024

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