add method

bool add(
  1. E e
)

Adds the element e to this, and returns wether the element was succesfully added or not.

You can always add elements, even duplicated elemneted are added, so this always return true.

Implementation

bool add(E e) {
  _length++;
  final added = _backingSet.add([e]);
  if (!added) {
    _backingSet.lookup([e]).add(e);
  }
  return true;
}