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React 19+ · Hook

useReducer

useReducer lets a component manage state with a reducer. You dispatch actions, and the reducer returns the next state.

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Syntax

const [state, dispatch] = useReducer(reducer, initialArg, init?)

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  • useState
  • flushSync
  • dispatch
  • reducer
  • initializer function

Source: useReducer – React API Reference. Checked 2026-11-03.