Generics trong Dart

class Box<T> {
  T value;
  Box(this.value);
}
 
var intBox = Box<int>(42);
var stringBox = Box<String>("Hello");

T first<T>(List<T> items) => items.first;
 
var number = first<int>([1, 2, 3]);  // Type inference
var word = first(['a', 'b', 'c']);

class SortedList<T extends Comparable<T>> {
  final List<T> _items = [];
  
  void add(T item) {
    _items.add(item);
    _items.sort();
  }
}