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.