Conditional Rendering

function Greeting({ isLoggedIn }) {
  if (isLoggedIn) {
    return <h1>Welcome back!</h1>;
  }
  return <h1>Please sign in.</h1>;
}

// Using && for simple conditions
function Notification({ message }) {
  return (
    <div>
      {message && <p>{message}</p>}
    </div>
  );
}