Redux Interview Preparation Practice Tests

Redux is a popular library for managing application state in JavaScript environments, commonly used with libraries such as React. It provides a consistent approach to handling state across an entire application, which can be especially useful in complex interfaces.

Redux operates on a few core principles: a single source of truth, state read-only, and changes made through pure functions. The single source of truth means that the entire state of the application is stored in one object tree within a single store. This makes it easier to track changes over time and debug or interact with the state.

The state in Redux is read-only. To make changes, an action must be dispatched, describing what happened. This ensures that neither the views nor the network callbacks will ever write directly to the state. Instead, they express an intent to transform the state.

Changes in Redux are made with pure functions called reducers. A reducer takes the previous state and an action, and returns the next state. It’s important that reducers stay pure—without side effects such as API calls and routing transitions. This predictability means that all changes are centralized and happen one by one in a strict order.

Redux also supports middleware, enabling more complex behaviors like asynchronous actions or logging, and tools that can log actions, replay them, and serialize the state. For larger applications, Redux helps maintain consistency and predictability, making the state easier to manage and debug. This structured approach helps developers understand and predict application behavior, leading to more maintainable code.

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