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.
E get single { // Note that this throws correctly if the queue is empty // because reading the element of the sentinel throws. if (identical(_sentinel._nextLink, _sentinel._previousLink)) { _DoubleLinkedQueueEntry<E> entry = _sentinel._nextLink; return entry._element; } throw IterableElementError.tooMany(); }
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https://api.dartlang.org/stable/2.0.0/dart-collection/DoubleLinkedQueue/single.html