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 { Iterator<E> it = iterator; if (!it.moveNext()) throw IterableElementError.noElement(); E result = it.current; if (it.moveNext()) throw IterableElementError.tooMany(); return result; }
© 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/IterableMixin/single.html