How can I reset accumulator of scan on ReplaySubject? - rxjs

Question

I have a ReplaySubject that accumulate data with scan operator and every 10000 ms should be reset. Is there any another way to do it?
Now:
let subject = new ReplaySubject();
subject.scan((acc, cur) => {
acc.push(cur);
return acc;
}, [])
.subscribe(events => {
localStorage.setItem('data', JSON.stringify(events))
});
subject
.bufferTime(10000)
.map(() => {
subject.observers[0]._seed = [];
})
.subscribe(() => localStorage.removeItem('data'));

Answer 1

I asked a very similar question few days ago and later answered myself
accumulating values such as with scan but with the possibility to reset the accumulator over time
maybe this can help you
SOME MORE DETAILS
An alternative approach is to have an Observable which acts as a timer which emits at a fixed interval, 10000ms in your case.
Once this timer emits, you pass the control to the Observable that cumululates via scan operator. To pass the control you use the switchMap operator to make sure the previous instance of the Observable completes.
If I understand correctly what you want to achieve, I would use a normal Subject rather than ReplaySubject.
The code could look something like this
const subject = new Subject<number>();
const timer = Observable.timer(0, 1000).take(4);
const obs = timer.switchMap(
() => {
console.log('-----');
return subject
.scan((acc, cur) => {
acc.push(cur);
return acc;
}, []);
}
)
obs.subscribe(
events => {
console.log(JSON.stringify(events))
}
);
// TEST DATA EMITTED BY THE SUBJECT
setTimeout(() => {
subject.next(1);
}, 100);
setTimeout(() => {
subject.next(2);
}, 1100);
setTimeout(() => {
subject.next(3);
}, 2100);
setTimeout(() => {
subject.next(4);
}, 2200);