How can I implement a fallback UI in my React application?

How can I implement a fallback UI in my React application?

You can implement a fallback UI in React by using the ErrorBoundary component to catch errors and display a fallback UI.

Can you show me a code example of how to do that?

Sure! Here's a simple example:

class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false };
  }

  static getDerivedStateFromError(error) {
    return { hasError: true };
  }

  componentDidCatch(error, errorInfo) {
    console.error('Error caught in ErrorBoundary:', error, errorInfo);
  }

  render() {
    if (this.state.hasError) {
      return <h1>Something went wrong.</h1>;
    }
    return this.props.children;
  }
}

You can wrap your components with ErrorBoundary to catch errors.

What if I want to show a loading state instead?

You can manage loading states using local component state or context. For example, you can set a loading state before fetching data and display a loading spinner while the data is being fetched.