Move back to the previous element.
Returns true and updates current if successful. Returns false and sets current to null if there is no previous element.
bool movePrevious();
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-core/BidirectionalIterator/movePrevious.html