Creates a List containing the elements of this Iterable.
The elements are in iteration order.
The list is fixed-length if growable is false.
Source
List<E> toList({ bool growable: true }) {
List<E> list;
if (growable) {
list = new List<E>()..length = length;
} else {
list = new List<E>(length);
}
_writeToList(list);
return list;
}