Свойство length

int length

override

Количество пар «ключ/значение» в отображении.

Реализация

int get length => _length;

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.19.6/dart-html/Storage/length.html