clear method
Removes all objects from this list; the length of the list becomes zero.
The list must be growable.
final numbers = <int>[1, 2, 3];
numbers.clear();
print(numbers.length); // 0
print(numbers); // []
Implementation
@override
void clear() {
_entries.clear();
_modCount = 0;
_purgeModCount = 0;
_purgeTime = DateTime.now();
}