main() {
var medals = new Set();
medals.add("gold");
medals.add("silver");
medals.add("bronze");
// HashSets use the equality operator (==) to determine
// if it already contains an item
medals.add("gold");
print('has gold? ${medals.contains("gold")}');
print('has platinum? ${medals.contains("platinum")}');
// Sets can be constructed from Iterables
var meals = new Set.from(['breakfast', 'lunch', 'dinner']);
// Some built-in features:
print(medals.union(meals));
print(medals.lookup("gold"));
print(medals.lookup("platinum"));
print(medals.difference(meals));
}
$ dart set.dart
has gold? true
has platinum? false
{gold, silver, bronze, breakfast, lunch, dinner}
gold
null
{gold, silver, bronze}