Why should you care?

Complex dashboards (live trades, notifications) are easier when everything is declarative data flow.

See it live — copy this example

Paste into your MeanVerse project (Angular + Express + MongoDB), then run with ng serve / node / mongosh as noted.

readonly vm$ = combineLatest([
  this.store.select(selectAccounts),
  this.store.select(selectFilter)
]).pipe(
  map(([accounts, filter]) => ({
    rows: accounts.filter(a => a.region === filter.region),
    totalBalance: accounts.reduce((s, a) => s + a.balance, 0)
  }))
);
// template: @if (vm$ | async; as vm) { ... }

What happened?

• combineLatest emits when accounts or filter change.
• map builds view-model object.
• Template binds once to vm — no imperative DOM updates.

Practice next

1. Identify UI that mixes subscribe callbacks — refactor to one vm$.
2. Push side effects to effect() or tap with care.
3. Keep templates dumb — logic in selectors/operators.
4. Add scan operator for running balance history chart.
5. Introduce @ngrx/component-store for one feature.

Remember

Events up, streams sideways, async pipe down. View-models combine slices for templates. Fits live MeanVerse dashboards well.

Ops war room

MeanVerse NOC screen merges alerts, metrics, and map markers.

Outcome: combineLatest keeps panel in sync without manual refresh buttons.