What is Redux in React?
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What problem does Redux solve?
In larger React apps, managing state (data like user info, UI status, etc.) across many components can get complicated. Components might need to share or update the same data, which can lead to tangled and hard-to-maintain code.
Key concepts of Redux:
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Single Source of Truth: All application state is stored in one central store — an object tree.
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State is Read-Only: The only way to change the state is by dispatching actions, plain objects describing what happened.
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Pure Functions (Reducers): Reducers receive the current state and an action, then return a new state without mutating the old one.
How it works with React:
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React components subscribe to the Redux store.
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When the store updates, components re-render with the latest state.
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Components dispatch actions to request state changes (like "ADD_TODO" or "LOGIN_SUCCESS").
Basic Redux flow:
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Dispatch an action (e.g.,
{ type: 'INCREMENT' }) -
The reducer processes the action and returns a new state.
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The store updates the state.
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React components react to state changes and update the UI.
Why use Redux?
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Makes state predictable and easier to debug.
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Enables time-travel debugging and state persistence.
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Simplifies sharing state across many components.
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Encourages a clear, structured architecture.
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