Combine and emit once?

[thatcort]

Hi,

How do I combine multiple inputs (like combineLatest), coalesce their changes over a tick of the event loop and then only emit a single time on the next tick of the loop? Schedulers are a bit confusing to me, so apologies if this should be obvious.

Thank you!

[voliva]

I think the closest/easiest is debounceTime(0). Not sure if it will do exactly "the next tick", because it depends on the implementation, but it should be close enough:

const value$ = timer(0, 1000);

combineLatest([value$, value$, value$])
  .pipe(debounceTime(0))
  .subscribe((combined) => console.log(combined));

https://stackblitz.com/edit/rxjs-tyrmlz?file=index.ts

If you really want "the next tick" you can try writing an operator by yourself. An operator is just a function that takes the previous observable and returns a new one that enhances it. Just use new Observable(observer => constructor.

[thatcort]

Thank you! That should be close enough!