React Native React Native State Management & Performance

Question 1

Which React hook is used to manage local component state in React Native?

Accepted Answer

useState

Answer

useState returns a state variable and a setter function, enabling functional components to manage local reactive state.

Question 2

What is the primary purpose of the useEffect hook in React Native?

Accepted Answer

To perform side effects like API calls and subscriptions

Answer

useEffect runs side effects after render, such as fetching data, setting up subscriptions, or directly manipulating the DOM.

Question 3

Which library provides a global state management solution commonly used in React Native apps?

Accepted Answer

Redux

Answer

Redux is a predictable state container that manages global application state using actions, reducers, and a single store.

Question 4

What does the useMemo hook do in React Native?

Accepted Answer

Memoizes the result of an expensive computation

Answer

useMemo caches the result of a computation and only recalculates when its dependency array changes, preventing unnecessary recalculations.

Question 5

What is the Context API used for in React Native?

Accepted Answer

Sharing state across components without prop drilling

Answer

Context API allows data to be passed through the component tree without explicitly passing props at every level.

React Native Practice Test