The useReducer Hook: Predictable State Updates
useReducer is a state machine for your components, managing complex state changes predictably. Use it when state logic is complex or the next state depends on the previous one, like in a shopping cart.
useReducer is a React Hook for managing complex component state. Think of it as a predictable state machine: you `dispatch` actions describing *what happened*, and a `reducer` function calculates the new state. It's ideal when state logic involves multiple sub-values or when the next state depends on the previous one, like in a multi-step form. The biggest footgun is mutating state directly inside the reducer. Reducers must be pure functions; always return a *new* state object, otherwise React won't re-render correctly.
Read the original → react.dev
- #react
- #hooks
- #state management
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