removeLast method

@override E? removeLast()

Removes and returns the last object in this list.

The list must be growable and non-empty.

final parts = <String>['head', 'shoulder', 'knees', 'toes'];
final retVal = parts.removeLast(); // toes
print(parts); // [head, shoulder, knees]

Implementation

@override
E? removeLast() {
  _checkUnmodifiableAndFixLength();

  if (length == 0) {
    // purge GCed
    throw IterableElementError.noElement();
  }

  if (_segList.isEmpty) {
    _length -= 1;
    return null;
  }

  final seg = _segList.last;
  if (seg.end < _length) {
    _length -= 1;
    return null;
  }
  final elements = seg._elements;
  final elmWeakRef = elements.removeLast();
  _elmCount -= 1;
  final elm = elmWeakRef.target;
  if (elements.isEmpty) {
    // all elements removed in the segment; remove the segment
    _segList.removeLast();
  }
  _length -= 1;
  return elm;
}