Redux Interview Questions

What is Redux primarily used for in application development?

• Managing and updating user interfaces

• Managing and updating application state

• Managing database transactions

• Managing network protocols

According to the principles of Redux, how is the global state of an application stored?

• In multiple object trees across different stores

• In a single object tree within a single store

• In a distributed system across various networks

• In a relational database

What does the principle "State is read-only" in Redux imply?

• State can be modified directly by any function

• State can only be changed by emitting an action

• State is mutable through external APIs

• State changes can be made without restrictions

What are "reducers" in the context of Redux?

• Functions that issue commands to change the state

• Functions that mutate the state directly

• Pure functions that specify how the state is transformed

• Network callbacks that manage state synchronization

How does the initial setup of a Redux application begin?

• By creating a root reducer function

• By dispatching the first action

• By connecting to a database

• By rendering the first UI component

What is the primary role of the dispatcher in Redux?

• To directly update the state

• To handle the UI rendering

• To initiate changes in the state by emitting an action

• To save the state changes to a database

Which of the following is NOT a recommended practice within a Redux reducer?

• Keeping the function pure by not mutating its arguments

• Making API calls and handling routing transitions

• Avoiding side effects like date or random number generation

• Calling other reducers for nested state updates

What is a key difference between React context and React Redux in terms of use-case?

• React context is better for frequent state updates

• React Redux does not use context internally

• React context is primarily for passing data down deeply nested components

• React Redux increases developer responsibility for code updates

What is an action in Redux?

• A function that returns a state object.

• A JavaScript object that describes something that happened in the application.

• A method that updates the state within the store.

• A callback function triggered by state changes.

Which of the following is NOT a responsibility of a Redux store?

• Holds the current application state inside.

• Directly updates the state in response to actions.

• Allows access to the current state via store.getState().

• Registers listener callbacks via store.subscribe(listener).