It may allow beginners to taste the sweetness of not following the rules

Summary

https://react.dev/learn/queueing-a-series-of-state-updates

The first challenge in this chapter can still work normally even if it is written like this, because it relies on click behavior

async function handleClick() {
    setPending(pending + 1);
    await delay(3000);
    setPending(pending=>pending - 1);
    setCompleted(completed=>completed + 1);
  }

However, if it is changed to this, it will not work. At this point, we must change setPending(pending + 1) to setPending(pending => pending + 1)

async function handleClick() {
    setTimeout(()=> {setPending(pending + 1);}, 1000)
    await delay(3000);
    setPending(pending=>pending - 1);
    setCompleted(completed=>completed + 1);
  }

Page

https://react.dev/learn/queueing-a-series-of-state-updates

Details

Perhaps some annotations could be added

從連結的 queueing-a-series-of-state-updates 頁面開始，檢視第一個挑戰及其 state update 範例。重現 issue 中描述的延遲 setTimeout 變體，然後判斷應在哪裡加入註解來說明 functional updater 形式。當頁面清楚警告這種情況，且挑戰仍然容易理解時，即表示完成。