Possible conceptual pitfall when discussing accessing a state variable set in a previous render

Hi there!

In this section: https://react.dev/learn/you-might-not-need-an-effect#adjusting-some-state-when-a-prop-changes

It took me a while to understood that prevItems would not be changed until setItems was invoked on it. What tripped me there was that I thought that useState(X) always set items to X on every re-render. Once I understood that prevItems is set to X only when the state is initialized, everything is clear.

This might perhaps be a good place in the docs to clarify (either on a couple of sentences or on its own Pitfall section) that setState will only initialize a value, but not update it during a re-render.

I take this opportunity for congratulating the team on the new React docs. There are one of the best technical documentation pieces I've read in my entire career. 🚀

Lisez la section liée « Adjusting some state when a prop changes » de la documentation de React et examinez-y l’explication de useState et setState d’un rendu à l’autre. C’est terminé lorsque la section distingue clairement l’initialisation initiale de l’état des mises à jour ultérieures et répond au malentendu signalé.