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Depending on the action, this function determines what the state should contain. It returns an object, which is subsequently used to alter or replace the state.

Reducers are used to manage the state of an application. If a user types something in an HTML input field, for example, the application must manage this UI state (e.g. controlled components).

Introduction. A reducer is a pure function in Redux that accepts an action and the application's previous state and returns the new state. The action specifies what occurred, and the reducer's role is to return the new state as a result of that action.

A reducer is a pure function in Redux that accepts an action and the application's previous state and returns the new state. The action specifies what occurred, and the reducer's role is to return the new state as a result of that action.

Redux allows users to control the application's state in a single location, making changes more predictable and traceable. It makes it easier to reason about how the application is changing. All of these advantages, however, come with tradeoffs and limitations.

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