Dart
xxxxxxxxxximport 'dart:async';const Duration delay = const Duration(milliseconds: 200);Future loadLastName(String firstName) { return new Future.delayed(delay).then((_) { return firstName + 'son'; });}Future loadLastName2(String firstName) async { await new Future.delayed(delay); return firstName + 'son';}main() async { var gregsLastName = await loadLastName('greg'); var stevesLastName = await loadLastName2('steve'); print('greg $gregsLastName'); print('steve $stevesLastName');}$ dart async_await.dart greg gregson steve steveson
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