"is subscribing to a lot of events in ngonint bad" Code Answer's
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is subscribing to a lot of events in ngonint bad
Fierce Flamingo
on Jun 10, 2020
import { Subject } from "rxjs"
import { takeUntil } from "rxjs/operators"
@Component({
moduleId: __moduleName,
selector: "my-view",
templateUrl: "../views/view-route.view.html"
})
export class ViewRouteComponent implements OnInit, OnDestroy {
componentDestroyed$: Subject<boolean> = new Subject()
constructor(private titleService: TitleService) {}
ngOnInit() {
this.titleService.emitter1$
.pipe(takeUntil(this.componentDestroyed$))
.subscribe((data: any) => { /* ... do something 1 */ })
this.titleService.emitter2$
.pipe(takeUntil(this.componentDestroyed$))
.subscribe((data: any) => { /* ... do something 2 */ })
//...
this.titleService.emitterN$
.pipe(takeUntil(this.componentDestroyed$))
.subscribe((data: any) => { /* ... do something N */ })
}
ngOnDestroy() {
this.componentDestroyed$.next(true)
this.componentDestroyed$.complete()
}
}Source: stackoverflow.com
is subscribing to a lot of events in ngonint bad
Fierce Flamingo
on Jun 10, 2020
@Component({ ... })
export class SmartComponent implements OnInit, OnDestroy {
private subscriptions = new Subscription();
constructor(private heroService: HeroService) {
}
ngOnInit() {
this.subscriptions.add(this.heroService.getHeroes().subscribe(heroes => this.heroes = heroes));
this.subscriptions.add(/* another subscription */);
this.subscriptions.add(/* and another subscription */);
this.subscriptions.add(/* and so on */);
}
ngOnDestroy() {
this.subscriptions.unsubscribe();
}
}Source: stackoverflow.com
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