length property

int length
override

Returns the number of objects in this list.

The valid indices for a list are 0 through length - 1.

Implementation 

int get length => _lists.fold(0, (length, list) => length + list.length);
void length= (int length)
override

Changes the length of this list.

If newLength is greater than the current length, entries are initialized to null.

Throws an UnsupportedError if the list is fixed-length.

Implementation 

set length(int length) {
  _throw();
}