Preventing an RxJS Observable interval: A step-by-step guide

Question

Preventing an RxJS Observable interval: A step-by-step guide

I am facing a unique scenario where I am using an RxJS interval, but I might need to abruptly stop it at any point. I thought there would be a simple method like cancel() or stop() similar to clearTimeout for intervals. Is there a way to stop an interval once it has started? If not, what alternative approach can I take?

Essentially, I am iterating through a large array but certain external events may require me to halt the iteration and move on to a different task. I am hoping that there is a straightforward solution that I may have overlooked in the documentation. Thank you.

javascript rxjs observable rxjs5

Answer 1

Answer №1

Is there a way to halt an interval mid-operation?

To stop an interval in the middle of its operation, you can utilize the .takeUntil operator. This operator allows you to complete an observable when another observable emits a value. To demonstrate, here is an example that stops an interval after 5 seconds:

Rx.Observable.interval(100)
  .takeUntil(Rx.Observable.timer(5000))
  .subscribe(val => console.log(val));

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.5.2/Rx.min.js"></script>

Answer 2

Is there a way to halt an interval mid-operation?

To stop an interval in the middle of its operation, you can utilize the .takeUntil operator. This operator allows you to complete an observable when another observable emits a value. To demonstrate, here is an example that stops an interval after 5 seconds:

Rx.Observable.interval(100)
  .takeUntil(Rx.Observable.timer(5000))
  .subscribe(val => console.log(val));

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.5.2/Rx.min.js"></script>

Answer 3

Answer №2

Simply opt out:

import { interval } from 'rxjs';

const subscription = interval(1000)
  .pipe(...)
  .subscribe();

...

subscription.unsubscribe();

Keep in mind that because interval() is asynchronous, you have the option to invoke unsubscribe() within the subscribe's callback as well.

July 2019: Revised for RxJS 6.

Answer 4

Simply opt out:

import { interval } from 'rxjs';

const subscription = interval(1000)
  .pipe(...)
  .subscribe();

...

subscription.unsubscribe();

Keep in mind that because interval() is asynchronous, you have the option to invoke unsubscribe() within the subscribe's callback as well.

July 2019: Revised for RxJS 6.

Preventing an RxJS Observable interval: A step-by-step guide

Answer №1

Answer №2

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