flutter pub add tuple根據套件公開資料產生的選型評估，僅供參考。
元組套件為 Dart 提供了一種輕量級、類型安全的元組資料結構，可將多個可能不同類型的值組合成單一的不可變物件。它支援最多 7 個元素，並提供直覺的語法用於建立、存取與解構。設計上強調簡潔與效能，能提升程式碼清晰度，讓回傳或傳遞多個相關值時無需定義自訂類別。此套件特別適用於函數式程式設計模式，以及需要簡潔資料聚合的場合。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
A library providing a tuple data structure.
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.
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.