Idea-[context] StateRef provider instead of state and dispatch in separate hooks
還沒有人認領這個 Issue。
- 主要語言
- JavaScript
- 星號
- 11.8k
- 分支
- 7.9k
- 平均合併
- 1 天 11 小時
- 30 天內合併 PR
- 11
描述
As per docs
const [state, dispatch] = useReducer(reducer,initData);
return (
<StateContext.Provider value={state}>
<DispatchContext.Provider value={dispatch}>
{children}
</DispatchContext.Provider>
</StateContext.Provider>)
as we separated state and dispatch now we can be sure that the component using only useDispatch doesn't rerender with state update.
additional boilerplate
additional boilerplate in case when a component use both state and dispatch
const state=useState()
const dispatch=useDispatch()
what if a component have to rely on the state only while handling events
const handleClick=()=>{
if(state.open){
...
}
else{
....
}
}
suggesting StateRef provider
const [state, dispatch] = useReducer(reducer,initData);
const stateRef = React.useRef(state);
stateRef.current=state // while rendering or preferably in effect
return (
<StateContext.Provider value={state}>
<StateRefContext.Provider value={stateRef}>
<DispatchContext.Provider value={dispatch}>
{children}
</DispatchContext.Provider>
</StateRefContext.Provider>
</StateContext.Provider>)
export function useState() {
const state= useContext(StateContext);
const dispatch= useContext(DispatchContext);
return {state,dispatch}
}
export function useStateRef() {
const stateRef= useContext(StateRefContext);
const dispatch= useContext(DispatchContext);
const {stateRef,dispatch}
}
or with memoization
const [state, dispatch] = useReducer(reducer,initData);
const value={state,dispatch}
const stateRef = React.useRef(state);
stateRef.current=state // while rendering or preferably in effect
const refValue=useMemo(()=>({stateRef,dispatch}),[])
return (
<StateContext.Provider value={value}>
<StateRefContext.Provider value={refValue}>
/*<DispatchContext.Provider value={dispatch}*/
{children}
</StateRefContext.Provider>
</StateContext.Provider>)
we can use either one of the hooks based on how a component depended on the state
const {state,dispatch}=useState() //for rendering
// or
const {stateRef,dispatch}=useStateRef() //for referring state
// based on how a component depended on the state
useStateProvider can be used when a component uses the state and Having dispatch provided with it doesn't do any harm.
useStateRefProvider can be used when a component has to refer to the state in only event handlers. Instead of wrapping a component or prop drilling an event handler corresponding to where a component has been used.
Thus increasing the reusability of the components
If it is wrong or an absolute anti-pattern please correct me, it will help in deepening my understanding
It is my first time writing in github, It`s unintentional if I failed to comply with your contributing guidelines
thank you
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研究方向
未指定檔案或測試。先檢視已記錄的 useReducer、useContext、useState 和 useDispatch 使用模式,接著判斷 StateRef provider 和 useStateRef hook 是否適合此專案;若要視為完成,則需要有達成共識的設計、文件化的使用方式,以及任何相應的範例或測試。
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
- 功能
- 難度
- 5/5
- 預估耗時
- 一週以上
- 活躍度
- 停滯
- 描述清晰度
- 需要釐清
- 新手友好度
- 20/100