The statement "Error boundaries are defined using the try...catch statement" is NOT true. Error boundaries in React are defined using special error boundary components and not the traditional try...catch statement. Error boundaries use the componentDidCatch() method to catch errors in child components and provide a graceful way to handle them. They can also replace parts of the component tree but are not defined using traditional error-handling syntax.

You can directly use the setState method in class-based components. Functional components with hooks use the useState hook instead to manage state. So, setState is typically associated with class-based components, and using it in functional components will result in an error.

Error Boundaries in React are designed to catch errors during rendering but do not catch errors that occur inside asynchronous code (e.g., in setTimeout or fetch callbacks) or event handlers. It's important to understand this limitation when using Error Boundaries to handle errors in your React applications.

In CSS Modules, the ":global-selector" can be used to ensure specificity without resorting to deep selectors. ":global-selector" allows you to define styles that are not scoped to a specific module, making them accessible globally. The other options are not valid constructs in CSS Modules.

When a Websocket connection drops in a React application, it's essential to implement a reconnect mechanism. Option 2 is the correct approach, using the onclose event and backoff strategies to establish a new connection. The other options are not recommended as they can lead to suboptimal user experiences or performance issues.

In React Testing Library, to find an element by its role, you can use the query findByRole(). This query is especially useful when you want to locate elements based on their accessibility roles, such as finding buttons, links, or other interactive elements. It helps ensure your tests are more accessible and accurately represent how users interact with your React components.

A significant difference between React for web and React Native is that React for web uses CSS for styling, while React Native uses JavaScript-based styles. In React Native, styles are applied using JavaScript objects, providing a more native feel and allowing for better performance and flexibility when styling components.

When you have pages that need to be private and cannot be pre-rendered, Next.js recommends using getServerSideProps(). This function allows you to fetch data on the server for each request, making it suitable for dynamic or private content that cannot be statically generated. getStaticPaths() and getStaticProps() are typically used for pre-rendering, while useEffect() is a React hook and not directly related to server-side rendering.

The strategy that prioritizes network requests over cache but falls back to cache if the network is unavailable is called "Cache-First." This approach optimizes performance by serving cached content when possible while ensuring the latest data is fetched when the network is available, making it a common strategy for progressive web applications (PWAs) and service workers.

JSX (JavaScript XML) gets compiled into JavaScript by tools like Babel. It's important to understand that JSX is a syntax extension for JavaScript, allowing developers to write HTML-like code within their JavaScript files. This JSX code is then transformed into standard JavaScript code that browsers can understand.