Why use `useEffect` to avoid hydration error?

[oak bobcat]

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[deep orbit]

If I apply logic to conclude that the following code is correct, Next throws hydr error at me

const [cards, setCards] = useState<TMemoGame['cards']>(prepareCards(props.cards))

I hate it because I am having an aesthetic issue as cards do not instantly appear on the page, only is the js loaded they will also appear. It makes layout shift

I seem to understand what's going on. The mismatch between server and client lists occurs because this function runs twice - once by server, once by client - and as prepareCards shuffles the list, the results differ