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isEmpty property
bool isEmptyReturns true if there are no elements in this collection.
May be computed by checking if iterator.moveNext() returns false.
Source
bool get isEmpty => readClasses().isEmpty;
  © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
 https://api.dartlang.org/stable/1.24.3/dart-svg/AttributeClassSet/isEmpty.html