Angular 2: Convert Observable to Promise

Question

Q) How do I convert the following observable to a promise so I can call it with .then(...)?

My method I want to convert to a promise:

Answer 1

A lot of comments are claiming toPromise deprecated but as you can see here it's not.

So please juste use toPromise (RxJs 6) as said:

//return basic observable
const sample = val => Rx.Observable.of(val).delay(5000);
//convert basic observable to promise
const example = sample('First Example')
  .toPromise()
  //output: 'First Example'
  .then(result => {
    console.log('From Promise:', result);
  });

async/await example:

//return basic observable
const sample = val => Rx.Observable.of(val).delay(5000);
//convert basic observable to promise
const example = await sample('First Example').toPromise()
// output: 'First Example'
console.log('From Promise:', result);

Read more here.

And please remove this wrong claim saying toPromise is deprecated.

---

Note: Otherwise you can use .pipe(take(1)).toPromise but as said you shouldn't have any problem using above example.