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/Dart 2

firstKey method

K firstKey ()

Get the first key in the map. Returns null if the map is empty.

Implementation

K firstKey() {
  if (_root == null) return null;
  return _first.key;
}

© 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/SplayTreeMap/firstKey.html