RxJS 5, converting an observable to a BehaviorSubject(?)

Question

I have a parent observable that, once it has a subscriber, will do a lookup and emit a single value, then complete.

I\'d like to convert that into an observable (or

Answer 1

I've implemented a method to convert Observables to BehaviorSubjects, as I think that the shareReplay method isn't very readable for future reference.

import { Observable } from 'rxjs/Observable';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';

export function convertObservableToBehaviorSubject(observable: Observable, initValue: T): BehaviorSubject {
    const subject = new BehaviorSubject(initValue);

    observable.subscribe(
        (x: T) => {
            subject.next(x);
        },
        (err: any) => {
            subject.error(err);
        },
        () => {
            subject.complete();
        },
    );

    return subject;
}