React Events, State, useEffect and Routing

What is "state" in React?

• A built-in method to handle APIs

• An object that holds data that may change over time

• A function to trigger re-rendering

How do you define state in a functional component using Hooks?

• const [state, setState] = React.useContext()

• const state = useState()

• const [state, setState] = useState()

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

• useState()

• useEffect()

• useContext()

What happens when setState() is called in a component?

• The component is destroyed

• The component updates and re-renders

• The app reloads

What is the purpose of an event handler in React?

• To fetch API data

• To manage user interactions

• To call back-end functions

Which is the correct way to write an onClick event in JSX?

• <button onClick="handleClick()">Click</button>

• <button onclick="handleClick()">Click</button>

• <button onClick={handleClick}>Click</button>

• <button onclick={handleClick()}>Click</button>

What is a common use case for an onChange event in React?

• Detecting when a page reloads

• Listening to keyboard presses

• Submitting a form

• Handling form input changes

What is the main purpose of react-router-dom in a React application?

• To manage application state

• To manage routing and navigation

• To handle HTTP requests

Which component is used to define the routing context in react-router-dom v6?

• RouterProvider

• HashRouter

• BrowserRouter

What does the <Route> component do?

• Maps a path to a component

• Sends a request to an API

• Handles form submissions