@lynx-js/react / useReducer

#函数: useReducer()

#useReducer(reducer, initializerArg, initializer)

function useReducer<R, I>(
   reducer: R, 
   initializerArg: I, 
   initializer: (arg: I) => ReducerStateWithoutAction<R>): [ReducerStateWithoutAction<R>, DispatchWithoutAction]

An alternative to useState.

useReducer is usually preferable to useState when you have complex state logic that involves multiple sub-values. It also lets you optimize performance for components that trigger deep updates because you can pass dispatch down instead of callbacks.

#类型参数

#参数

#返回

[ReducerStateWithoutAction<R>, DispatchWithoutAction]

#Version

16.8.0

#参阅

https://react.dev/reference/react/useReducer

#定义于

.pnpm/@types+react@18.3.28/node_modules/@types/react/ts5.0/index.d.ts:1904

#useReducer(reducer, initializerArg, initializer)

function useReducer<R>(
   reducer: R, 
   initializerArg: ReducerStateWithoutAction<R>, 
   initializer?: undefined): [ReducerStateWithoutAction<R>, DispatchWithoutAction]

An alternative to useState.

useReducer is usually preferable to useState when you have complex state logic that involves multiple sub-values. It also lets you optimize performance for components that trigger deep updates because you can pass dispatch down instead of callbacks.

#类型参数

#参数

#返回

[ReducerStateWithoutAction<R>, DispatchWithoutAction]

#Version

16.8.0

#参阅

https://react.dev/reference/react/useReducer

#定义于

.pnpm/@types+react@18.3.28/node_modules/@types/react/ts5.0/index.d.ts:1920

#useReducer(reducer, initializerArg, initializer)

function useReducer<R, I>(
   reducer: R, 
   initializerArg: I & ReducerState<R>, 
   initializer: (arg: I & ReducerState<R>) => ReducerState<R>): [ReducerState<R>, Dispatch<ReducerAction<R>>]

An alternative to useState.

useReducer is usually preferable to useState when you have complex state logic that involves multiple sub-values. It also lets you optimize performance for components that trigger deep updates because you can pass dispatch down instead of callbacks.

#类型参数

#参数

#返回

[ReducerState<R>, Dispatch<ReducerAction<R>>]

#Version

16.8.0

#参阅

https://react.dev/reference/react/useReducer

#定义于

.pnpm/@types+react@18.3.28/node_modules/@types/react/ts5.0/index.d.ts:1938

#useReducer(reducer, initializerArg, initializer)

function useReducer<R, I>(
   reducer: R, 
   initializerArg: I, 
   initializer: (arg: I) => ReducerState<R>): [ReducerState<R>, Dispatch<ReducerAction<R>>]

An alternative to useState.

useReducer is usually preferable to useState when you have complex state logic that involves multiple sub-values. It also lets you optimize performance for components that trigger deep updates because you can pass dispatch down instead of callbacks.

#类型参数

#参数

#返回

[ReducerState<R>, Dispatch<ReducerAction<R>>]

#Version

16.8.0

#参阅

https://react.dev/reference/react/useReducer

#定义于

.pnpm/@types+react@18.3.28/node_modules/@types/react/ts5.0/index.d.ts:1954

#useReducer(reducer, initialState, initializer)

function useReducer<R>(
   reducer: R, 
   initialState: ReducerState<R>, 
   initializer?: undefined): [ReducerState<R>, Dispatch<ReducerAction<R>>]

An alternative to useState.

useReducer is usually preferable to useState when you have complex state logic that involves multiple sub-values. It also lets you optimize performance for components that trigger deep updates because you can pass dispatch down instead of callbacks.

#类型参数

#参数

#返回

[ReducerState<R>, Dispatch<ReducerAction<R>>]

#Version

16.8.0

#参阅

https://react.dev/reference/react/useReducer

#定义于

.pnpm/@types+react@18.3.28/node_modules/@types/react/ts5.0/index.d.ts:1979