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

rxjs-7_mergeWith.ts

import { interval } from "rxjs";
import { map, mergeWith } 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$.pipe(mergeWith(count6To9$)).subscribe(console.log);
// (after ~1s) 1 (immediately) 6
// (after ~1s) 2 (immediately) 7
// (after ~1s) 3 (immediately) 8
// (after ~1s) 4 (immediately) 9
// (after ~1s) 5