reactjs / reactjs/react.dev

Missing documentation of `dispatch` function's stability

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JavaScript
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描述

First, I like the new React docs a lot! Unfortunately, I can no longer find the following information about useReducer that was once available in the docs:

The useReducer hook returns an array with two elements: the current state and a dispatch function. The dispatch function is used to update the state by calling it with an action object. The dispatch function returned by useReducer has a lifecycle similar to that of the component it is used in. It is created when the component mounts and destroyed when the component unmounts. The dispatch function is guaranteed to be stable across re-renders.

Is this no longer the case?

On page Lifecycle of Reactive Effects there is a note box saying "In some cases, React knows that a value never changes..." and mentioning useState and useRef. It would be ideal if the documentation would explicitly enumerate all the stable return values from hooks, i.e., the ones that share the lifecycle of their component.

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  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

研究方向

從 Lifecycle of Reactive Effects 頁面和目前的 useReducer 文件開始,然後將它們與 issue 中引用的穩定性詳細資訊進行比較。追蹤 hook 回傳值保證的文件位置,並更新相關文件,以明確且一致地說明 dispatch 的穩定性以及預期穩定的 hook 值。

由索引模型根據 Issue 內容生成。

評估

技術堆疊
javascript, react
領域
documentation
Issue 類型
文件
難度
2/5
預估耗時
1-3 小時
活躍度
停滯
描述清晰度
基本清楚
新手友好度
48/100

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