How is Redux Toolkit different from classic Redux?
RTK removes classic Redux's boilerplate with createSlice, createAsyncThunk, and configureStore. It auto-generates actions, simplifies async, and sets up sensible store defaults. It is the official, modern way to use Redux.
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Redux is a state management library with a single store, actions, and reducers. Use it for complex, shared state across many components where Context causes too many re-renders or becomes unmanageable.
An action is dispatched, the store runs the relevant reducer, the reducer returns new state, and the new state flows to components via useSelector. It is a strict one-way flow that makes state updates predictable.
Because Redux relies on predictable, reproducible state updates for features like time-travel debugging. A pure reducer takes state and an action and returns new state with no side effects, so the same input always produces the same output.
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