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/Dart 2

single property

Length 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.

Implementation

Length get single {
  int len = this.length;
  if (len == 1) {
    return JS('Length', '#[0]', this);
  }
  if (len == 0) throw new StateError("No elements");
  throw new StateError("More than one element");
}

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-svg/LengthList/single.html