[What's New in RxJS 7] RxJS 7 concatWith #blog #rxjs

rxjs-7_concatWith.ts

import { interval } from "rxjs";
import { concatWith, map } from "rxjs/operators";

const count1To5$ = interval(1000).pipe(
  take(5),
  map(i => i + 1)
);

const count6To9$ = interval(1000).pipe(
  take(4),
  map(i => i + 6)
);

count1To5$.pipe(concatWith(count6To9$)).subscribe(console.log);
// (~1s apart) 1, 2, 3, 4, 5, 6, 7, 8, 9