#Function: useReducer()

#Call Signature

useReducer<S, A extends AnyActionArg>(reducer: (prevState: S, ...args: A) => S, initialState: S): [S, ActionDispatch<A>]

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.

#Type Parameters

#Parameters

#Returns

[S, ActionDispatch<A>]

#Version

16.8.0

#See

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

#Call Signature

useReducer<S, I, A extends AnyActionArg>(reducer: (prevState: S, ...args: A) => S, initialArg: I, init: (i: I) => S): [S, ActionDispatch<A>]

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.

#Type Parameters

#Parameters

#Returns

[S, ActionDispatch<A>]

#Version

16.8.0

#See

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