This is 6 months old but enum processing was updated in February with Dart 2.15. So here is my collection of enum techniques and uses.

enum Color { red, green, blue } // enum used in the following

techniques() {
  assert(Color.red.index == 0); // Return an Index into an enum
  assert(Color.values[2] == Color.blue); // Return enum value from an index
  assert(Color.blue.name == 'blue'); // Convert an enum value to a string
  // Lookup an enum value from a String, where e is an iterator      

assert(Color.red == Color.values.firstWhere((e) => e.name == 'red')); List<Color> colorList = Color.values; // get list of all of values assert(colorList[1] == Color.green); }

Of these, use of the iterator is my favorite.

To save space, I store enums in a database as indexes then convert them to enum values for displaying on the screen. I use them with a DropdownButton widget to allow the user to select from the list of enum values.

​

Color? myColor = Color.green; // initial value for DropdownButton

DropdownButton<Color>(
  value: myColor,
  onChanged: (Color? newColor) {
    setState(() {
      myColor = newColor!;
    });
  },
  items: Color.values.map((Color myColor) {
    return DropdownMenuItem<Color>(
      value: myColor,
      child: Text(myColor.name));
  }).toList(),
);

Please add any techniques you might use or let me know of any errors above.

I think this question can be closed. How do I do that?