[What's New in RxJS 7] Less memory consumption in higher-order observables #blog #rxjs

rxjs-7_memory-consumption.ts

import { of } from "rxjs";
import { map, concatAll } from "rxjs/operators";

of(1, 2, 3)
  .pipe(
    map(id =>
      fromFetch(`https://jsonplaceholder.typicode.com/todos/${id}`, {
        selector: resp => resp.json()
      })
    ),
    concatAll()
  )
  .subscribe(todo => console.log(todo.title));
// (after some time) delectus aut autem
// (after some time) quis ut nam facilis et officia qui
// (after some time) fugiat veniam minus