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toPromiseLast

Types​

function toPromiseLast<GValue>(
  subscribe: IObservable<IObservableToPromiseNotifications<GValue>>,
  options?: IObservableToPromiseLastOptions
): Promise<GValue>

Definition​

Converts an Observable of Notifications into a Promise.

It's similar to toPromiseAll, but it returns the last received next value instead of an Array.

Diagram​

Algorithm​

.catch.thentoPromiseLast(observable)observable.catch.thentoPromiseLast(observable)observablealt[if complete][if error]next: value1next: value2next: value3completevalue3error: errorerror

Example​

.thentoPromiseLast(_)ofWithNotifications(1, 2, 3).thentoPromiseLast(_)ofWithNotifications(1, 2, 3)next: 1next: 2next: 3complete3

Examples​

Simple http request​

toPromiseLast(fromFetch('https://some-url.site'))
  .then((response: Response) => {
    console.log(response.statusText);
  });

Simple http request aborted​

const controller = new AbortController();

toPromiseLast(fromFetch('https://some-url.site'), { signal: controller.signal })
  .then((response: Response) => {
    console.log(response.statusText);
  });

controller.abort(); // the request is properly aborted