length property

@override int get length

The number of elements in this Iterable.

Counting all elements may involve iterating through all elements and can therefore be slow. Some iterables have a more efficient way to find the number of elements. These must override the default implementation of length.

Implementation

@override
int get length {
  if (!step.isNegative) {
    return ((stop - start + 1) / step).ceil();
  } else {
    return ((start - stop + 1) / -step).ceil();
  }
}