equals method

bool equals(Iterable<E>? other, [ bool equals(E, E) = _defaultEquals ])

Whether other has the same elements as this iterable. Length and order dependent.

1,2,3,4 will match 1,2,3,4 but 4,1,2,1 will not match 1,1,2,4. 1,2,3,4 will not match 1,2,3 1,2,3, will not match 1,2,3,4.

Implementation

bool equals(Iterable<E>? other,
    [bool Function(E, E) equals = _defaultEquals]) {
  if (other == null) {
    return false;
  }

  final iter1 = iterator;
  final iter2 = other.iterator;

  while (true) {
    final iter1HasValue = iter1.moveNext();
    final iter2HasValue = iter2.moveNext();

    if (iter1HasValue != iter2HasValue) {
      return false;
    }

    if (iter1HasValue && iter2HasValue) {
      final iter1Value = iter1.current;
      final iter2Value = iter2.current;
      if (!equals(iter1Value, iter2Value)) {
        return false;
      }
      continue;
    }

    // both are false
    break;
  }

  return true;
}