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| import { EMPTY, from, of } from "rxjs"; import { catchError, delay, delayWhen, finalize, map, mergeMap, retry, tap, toArray } from "rxjs/operators";
const fetchObservable = (data) => { return from( new Promise((resolve) => { setTimeout(() => { resolve({ data }); }, 300); }) ); };
const concurrency = 5; const fetchConcurrently$ = from(YOUR_DATA).pipe( mergeMap((token) => { return fetchObservable(YOUR_DATA).pipe( map(({ data }) => data), delay(1000), retry(1), catchError(() => EMPTY) ); }, concurrency), map((data) => { return data.id; }), toArray(), delayWhen(() => Promise.resolve()), finalize(() => console.log("done")) );
fetchConcurrently$.subscribe((ids) => console.log(ids));
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