Why can enum values be compared using == instead of equals()?

In Dart (the language used for Flutter), an enum is a special type where each value is a singleton (a unique instance). Therefore, comparison using the == operator checks for object identity, not just equality of content, as is the case with regular objects.

This means that == for enums works correctly and safely, and there is no need to use the equals() method, which does not exist in Dart (it exists in Java). Example:

enum Color { red, green, blue }

void main() {
  var c1 = Color.red;
  var c2 = Color.red;
  print(c1 == c2); // true
}

Here, c1 == c2 returns true because both refer to the same Color.red object.