React and Hooks Quiz II

What is React state?

• An object that holds component-specific data and determines its behavior.

• A function used to update a component.

• A variable that is accessible globally in all components.

• A method used to fetch API data.

Which Hook is used to manage state in a functional component?

• useState

• useEffect

• useRef

• useContext

Which Hook is used to perform side effects in a functional component?

• useEffect

• useState

• useReducer

• useMemo

What is the correct way to update state in React using useState?

• setState(newValue)

• this.state = newValue

• useState(newValue)

• updateState(newValue)

What is the initial render phase in React lifecycle?

• The phase when a component is mounted for the first time.

• The phase when a component is removed from the DOM.

• The phase when a component is updated.

• The phase when a component receives new props.

Which lifecycle method is used for API calls in class components?

• componentDidMount

• componentWillUnmount

• shouldComponentUpdate

• componentDidUpdate

What does useEffect return if cleanup is needed?

• A function that cleans up side effects when the component unmounts.

• A boolean value.

• A promise that resolves when cleanup is complete.

• An empty object {}.

Which dependency array in useEffect runs the effect only once?

• [] (empty array)

• [count]

• null

• {}

Which method is used to remove a component from the DOM in class components?

• componentWillUnmount

• componentDidUpdate

• useEffect

• shouldComponentUpdate

Which Hook can replace componentDidMount, componentDidUpdate, and componentWillUnmount in functional components?

• useEffect

• useState

• useReducer

• useRef