increment method

void increment({
  1. num increment = 1,
})

If Data is of type int, double, float or any num, you can increment (default 1)

Implementation

void increment({num increment = 1}) {
  var oldData = data;
  data = ((data as num) + increment) as T?;
  if (isDisposed) return;
  notifyListeners();
  onUpdate?.call(oldData, data);
}