A library providing a tuple data structure.

Status - complete

We consider this package to be feature complete. With Dart 3.0, users now have the ability to use Records:

Records are an anonymous, immutable, aggregate type. Like other collection types, they let you bundle multiple objects into a single object.

  var record = (123, true);
  print('${record.$1}: ${record.$2}');

By and large, Records serve the same use cases that package:tuple had been used for. New users coming to this package should likely look at using Dart Records instead. Existing uses of package:tuple will continue to work, however we don't intend to enhance the functionality of this package; we will continue to maintain this package from the POV of bug fixes.

Usage example

const t = Tuple2<String, int>('a', 10);

print(t.item1); // prints 'a'
print(t.item2); // prints '10'

const t1 = Tuple2<String, int>('a', 10);
final t2 = t1.withItem1('c');
// t2 is a new [Tuple2] object with item1 is 'c' and item2 is 10.