final Throttling thr = new Throttling(duration: Duration(seconds: 2));
thr.throttle(() {print(' *ping #1');});
await Future.delayed(Duration(seconds: 1));
thr.throttle(() {print(' *ping #2');});
await Future.delayed(Duration(seconds: 1));
thr.throttle(() {print(' *ping #3');});

final Debouncing deb = new Debouncing(duration: Duration(seconds: 2));
deb.debounce(() {print(' *ping #1');});
await Future.delayed(Duration(seconds: 1));
deb.debounce(() {print(' *ping #2');});
await Future.delayed(Duration(seconds: 1));
deb.debounce(() {print(' *ping #3');});