What is the purpose of the Future object and how is it used in asynchronous programming?

The Future object in asynchronous programming in Flutter (and Dart) represents a promise to obtain the result of an operation in the future. It is used for working with tasks that execute asynchronously, such as loading data from a network or reading a file.

Future allows:

• Starting an operation without blocking the main thread.
• Subscribing to the result using methods like then(), catchError(), whenComplete().
• Using the await keyword for convenient asynchronous code syntax.

Example of usage:

Future<String> fetchData() async {
  // Simulate delay
  await Future.delayed(Duration(seconds: 2));
  return 'Data loaded';
}

void main() async {
  print('Starting download');
  String data = await fetchData();
  print(data);
}

Here, fetchData returns a Future<String> that completes after 2 seconds, after which the result can be obtained using await.