diffutil_dart 2.0.0

Calculate the difference between two lists as list of edit operations. Used for example for implicitly animating Flutter lists without having to maintain a StatefulWidget.

example/lib/main.dart

import 'package:diffutil_dart/diffutil.dart' as diffutil;

/// Note: This is a dart-only project, running flutter pub get will fail with an error message of a missing
/// pubspec.yaml in the example folder. Just run pub get instead.

void main() {
  final oldList = [1, 2, 3];
  final newList = [2, 3, 4];

  print('difference between $oldList and $newList, without move detection:');

  final listDiff = diffutil.calculateListDiff(oldList, newList).getUpdates();

  // use the diff using a list of diff objects
  for (final update in listDiff) {
    update.when(
      insert: (pos, count) => print('inserted $count item on $pos'),
      remove: (pos, count) => print('removed $count item on $pos'),
      change: (pos, payload) => print('changed on $pos with payload $payload'),
      move: (from, to) => print('move from $from to $to'),
    );
  }

  print('changeset: $listDiff');

  final oldList2 = [1, 2, 3];
  final newList2 = [1, 3, 2];

  print('\n');

  print('difference between $oldList2 and $newList2, without move detection:');

  final listDiff2 = diffutil
      .calculateListDiff(oldList2, newList2, detectMoves: false)
      .getUpdates();

  print('changeset: $listDiff2');

  print('\n');

  print('difference between $oldList2 and $newList2, with move detection:');

  final listDiff3 = diffutil
      .calculateListDiff(oldList2, newList2, detectMoves: true)
      .getUpdates();

  print('changeset: $listDiff3');

  print('\n');

  final oldList3 = [];
  final newList3 = [1, 2, 3];

  print('difference between $oldList3 and $newList3, batched:');

  final listDiff4 =
      diffutil.calculateListDiff(oldList3, newList3).getUpdates(batch: true);

  print('changeset: $listDiff4');

  print('\n');

  print('difference between $oldList3 and $newList3, unbatched:');

  final listDiff5 =
      diffutil.calculateListDiff(oldList3, newList3).getUpdates(batch: false);

  print('changeset: $listDiff5');

  print('\n');
}