Dart by Example: Set

  1. main() {
  2.   var medals = new Set();
  3.   medals.add("gold");
  4.   medals.add("silver");
  5.   medals.add("bronze");
  7.   // HashSets use the equality operator (==) to determine
  8.   // if it already contains an item
  9.   medals.add("gold");
  11.   print('has gold? ${medals.contains("gold")}');
  12.   print('has platinum? ${medals.contains("platinum")}');
  14.   // Sets can be constructed from Iterables
  15.   var meals = new Set.from(['breakfast', 'lunch', 'dinner']);
  17.   // Some built-in features:
  18.   print(medals.union(meals));
  19.   print(medals.lookup("gold"));
  20.   print(medals.lookup("platinum"));
  21.   print(medals.difference(meals));
  22. }
  23.  
  1. $ dart set.dart
  2. has gold? true
  3. has platinum? false
  4. {gold, silver, bronze, breakfast, lunch, dinner}
  5. gold
  6. null
  7. {gold, silver, bronze}

by @jryanio | source | license