Does Dart support enumerations?

Question

Does Dart support enumerations? For instance:

enum myFruitEnum { Apple, Banana } 

A cursory search of the docs suggests no.

Answer 1

Beginning 1.8, you can use enums like this:

enum Fruit {   apple, banana }  main() {   var a = Fruit.apple;   switch (a) {     case Fruit.apple:       print('it is an apple');       break;   }    // get all the values of the enums   for (List<Fruit> value in Fruit.values) {     print(value);   }    // get the second value   print(Fruit.values[1]); } 

---

The old approach before 1.8:

class Fruit {   static const APPLE = const Fruit._(0);   static const BANANA = const Fruit._(1);    static get values => [APPLE, BANANA];    final int value;    const Fruit._(this.value); } 

Those static constants within the class are compile time constants, and this class can now be used in, for example, switch statements:

var a = Fruit.APPLE; switch (a) {   case Fruit.APPLE:     print('Yes!');     break; } 

Answer 2

With r41815 Dart got native Enum support see http://dartbug.com/21416 and can be used like

enum Status {   none,   running,   stopped,   paused }  void main() {   print(Status.values);   Status.values.forEach((v) => print('value: $v, index: ${v.index}'));   print('running: ${Status.running}, ${Status.running.index}');   print('running index: ${Status.values[1]}'); } 

[Status.none, Status.running, Status.stopped, Status.paused]
value: Status.none, index: 0
value: Status.running, index: 1
value: Status.stopped, index: 2
value: Status.paused, index: 3
running: Status.running, 1
running index: Status.running

A limitation is that it is not possibly to set custom values for an enum item, they are automatically numbered.

More details at in this draft https://www.dartlang.org/docs/spec/EnumsTC52draft.pdf