What is the purpose of using the event.preventDefault() method within a form submission handler in React?
event.preventDefault()
To clear the form data after submission.
To prevent the browser from refreshing the page.
To validate the form data before submission.
To submit the form data asynchronously without using AJAX.
How can you display validation errors to the user in React?
By using a third-party library specifically for error display.
By relying solely on browser console logs for error reporting.
By conditionally rendering error messages based on validation results.
By directly manipulating the DOM to insert error messages.
How does the useEffect Hook in functional components relate to lifecycle methods in class components?
useEffect
useEffect is a replacement for componentDidMount only.
componentDidMount
There is no relationship between useEffect and lifecycle methods.
useEffect is only used for data fetching.
useEffect combines the functionality of componentDidMount, componentDidUpdate, and componentWillUnmount.
componentDidUpdate
componentWillUnmount
How do class components in React typically handle events?
By defining methods on the class that act as event handlers
Class components cannot handle events; only functional components can
By relying on external state management libraries for event handling
Using inline arrow functions directly in the JSX
What is the primary purpose of components in React?
To manage application state
To handle user interactions
To break down the UI into independent, reusable pieces
To directly manipulate the DOM
What is a key advantage of using a controlled component for a file input in React?
Direct access to the file data in the component's state.
Simplified styling of the file input element.
Improved browser compatibility for file uploads.
Automatic upload of the file to the server.
What is the primary use case for the useEffect hook?
To render components conditionally
To perform side effects like data fetching, DOM manipulation, or subscriptions
To manage state within a component
To handle form submissions
What is the primary characteristic of a controlled component in React?
It uses external libraries for form handling.
It directly manipulates the DOM to update form values.
It relies on the browser to manage form data.
It maintains its own internal state for form data.
Which of the following is a key difference between functional components and class components in React?
Functional components are used for complex UI logic, while class components are for simple elements
Functional components cannot receive props, while class components can
Functional components are stateless, while class components can have state
Functional components are written in JavaScript, while class components use TypeScript
What is the second argument of the useEffect Hook used for?
It defines the effect to be executed.
It provides access to the previous state and props.
It indicates the effect should be executed only once, like componentDidMount.
It specifies a list of dependencies that trigger the effect when they change.