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/Dart 2

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 (isEmpty) {
    throw new StateError('No such element');
  }
  if (_length > 1) {
    throw new StateError('Too many elements');
  }
  return _first;
}

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-collection/LinkedList/single.html