operator [] method
The object at the given index
in the list.
The index
must be a valid index of this list,
which means that index
must be non-negative and
less than length.
Implementation
@override
bool operator [](int index) {
if (index < 0 || index >= length) {
throw RangeError(index);
}
final slot = index ~/ 30;
final position = slot * 30;
final mask = 1 << (index - position);
return (_list[slot] & mask) != 0;
}