# single property

1. @override

E get single
override

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. This operation will not iterate past the second element.

## Implementation

    @override
    E get single {
      try {
        return _elements.single;
      } on StateError catch (e) {
        throw NoGuaranteeException('Queue is empty', cause: e);
      }
    }