Async and Practical

Futures

async and await

An async function returns a Future. await suspends until that future completes.

Program

Play the program to await an asynchronous name and greet.

futures.dart 
Future<String> fetchName() async {
  await Future.delayed(Duration.zero);
  return 'Ada';
}

Future<void> main() async {
  var name = await fetchName();
  print('Hello, $name');
}
async An `async` function returns a `Future` automatically.
await `await` pauses the function until the future resolves.
event loop `Future.delayed(Duration.zero)` yields to the event loop.