We call it "detail bubble" :)

Took me ages. Finally made it but not sure whether I fixed it as intended.

In this case the data and the mapping always belong together, you are only fetching the capitals, and you would never compute anything else than capitals. So I would also go for rxjs map.

I haven't used signals so I might be wrong here, but doesn't rxResource return a WritableSignal. So if you would set its value via 'countries.set()', only the computed will be reevaluated, not the rxjs mapper?