Transfer the rxjs operator takeUntil to its own method

In my Angular app, I have a BaseComponent class that includes the implementation of destroy$: Subject<void> for observables. Whenever I subscribe to a service, I find myself repeatedly writing:

this.myService.loadData()
    .pipe(takeUntil(this.destroy$))
    .subscribe(data => this.userData = data);

I am looking for a way to avoid the repetitive use of .pipe(takeUntil(this.destroy$)) and am considering creating an extension method for observables to handle takeUntil. For instance, I would like to move .pipe(takeUntil(this.destroy$)) to a custom method called ifAlive so that it could then be used like this:

this.myService.loadData()
    .ifAlive()
    .subscribe(...);

Any suggestions or ideas on how to achieve this?

Answer №1

If you're searching for a solution, consider using the async pipe. This allows Angular to manage the subscription and unsubscription process for you.

All you need to do is store the observable in a variable:

In your typescript file:

data$ = this.myService.fetchData()
 

Then in your HTML, surround your content with *ngIf='data$ | async as data':

<ng-container *ngIf='data$ | async as data'>

</ng-container>

By following this approach, Angular will take care of the subscription process, making your code more readable, testable, and debuggable.

Answer №2

Absolutely. You have the potential to abstract this concept as you have mentioned.

However, there are some elements that already handle unsubscribing for us:

  • async pipe
  • http client requests if it's just a network request and doesn't involve a new subscription as a callback

Moreover, from an angular standpoint, it is recommended to unsubscribe during the ngOnDestroy phase, as this signifies the end of the component lifecycle. While it's possible that you had already considered this, implementing your abstraction might introduce additional complexity. Something worth contemplating.

For instance, you would still need to maintain your subscriptions (especially within a component, as services don't utilize ngOnDestroy) and then perform the unsubscription process using your abstraction. This essentially defeats the purpose of abstraction since you'd still need to incorporate some standard code snippets.

In conclusion, while abstraction is beneficial for services, it can become considerably convoluted for components. It may be more practical to opt for the async pipe and local unsubscribing strategy as a preferred method.

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