An example app to demonstrate that the key={id} is a useful as hell This repository is made by create-t3-app Article for the repository is here (Czech): https://medium.com/@vojta.tranta/minitip-m%C3%A9n%C4%9B-useeffect-pro-%C4%8Dist%C5%A1%C3%AD-k%C3%B3d-jak-resetovat-stav-komponent-snadn%C4%9Bji-5b1f071288cc