How to wait for forEach to complete with asynchronous callbacks in dart?

In Dart, you can use the await keyword to wait for an asynchronous operation to complete. To wait for a forEach loop to complete with asynchronous callbacks, you can use the Future class to return a future that completes when all of the asynchronous operations in the loop have completed.

Here’s an example of how you can wait for a forEach loop with asynchronous callbacks to complete in Dart:

Future waitForForEach(List list) async {
  List futures = [];
  list.forEach((item) {
    futures.add(handleAsyncOperation(item));
  });
  await Future.wait(futures);
}

Future handleAsyncOperation(item) async {
  // Perform some asynchronous operation with item
  await Future.delayed(Duration(seconds: 1));
}

void main() async {
  await waitForForEach([1, 2, 3]);
  print('All operations have completed');
}

In this example, the waitForForEach function accepts a list and performs an asynchronous operation on each item in the list using the handleAsyncOperation function. The handleAsyncOperation function returns a future that completes after a one-second delay. The forEach loop adds each returned future to a list of futures. Finally, the Future.wait function is used to wait for all of the futures in the list to complete.