toPromise

signature: toPromise() : Promise

Example 1: Basic Promise

Example 2: Using Promise.all

import { of } from 'rxjs/observable/of';
import { delay } from 'rxjs/operators';
//return basic observable
const sample = val => of(val).pipe(delay(5000));
  convert each to promise and use Promise.all
  to wait for all to resolve
*/
const example = () => {
  return Promise.all([
  ]);
};
//output: ["Promise 1", "Promise 2"]
example().then(val => {
  console.log('Promise.all Result:', val);
});

Additional Resources

• toPromise
  - Official Docs