Enumerated types Dart

gistfile1.txt

//Enumerated types, often called enumerations or enums,
// are a special kind of class used to represent a fixed number of constant values.
//Declare an enumerated type using the enum keyword:
enum Color { red, green, blue }
//To get a list of all of the values in the enum, use the enum’s values constant.
List<Color> colors = Color.values;

void main() {
//You can use trailing commas when declaring an enumerated type.
//
// Each value in an enum has an index getter,
// which returns the zero-based position of the value in the enum declaration.
// For example, the first value has index 0, and the second value has index 1.
  assert(Color.red.index == 0);
  assert(Color.green.index == 1);
  assert(Color.blue.index == 2);

  print(colors);
  assert(colors[2] == Color.blue);

  var aColor = Color.blue;
//You can use enums in switch statements,
// and you’ll get a warning if you don’t handle all of the enum’s values:
  switch (aColor) {
    case Color.red:
      print('Red as roses!');
      break;
    case Color.green:
      print('Green as grass!');
      break;
    default: // Without this, you see a WARNING.
      print(aColor); // 'Color.blue'
  }
}