single property

E single

Checks that this iterable has only one element, and returns that element.

Throws a StateError if this is empty or has more than one element.

Implementation

E get single {
  if (_head == _tail) throw IterableElementError.noElement();
  if (length > 1) throw IterableElementError.tooMany();
  return _table[_head] as E;
}

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-collection/ListQueue/single.html