average property Null safety

double average

The arithmetic mean of the elements of a non-empty iterable.

The arithmetic mean is the sum of the elements divided by the number of elements.

The iterable must not be empty.


double get average {
  var result = 0.0;
  var count = 0;
  for (var value in this) {
    count += 1;
    result += (value - result) / count;
  if (count == 0) throw StateError('No elements');
  return result;