Step 1 - Simple enum

enum Priority { low, medium, high }

void main() {
  Priority p = Priority.high;
  print(p.name);
}

Step 2 - Enhanced enum (fields + methods)

enum HttpCode {
  ok(200),
  notFound(404);

  final int value;
  const HttpCode(this.value);

  bool get isSuccess => value >= 200 && value < 300;
}

void main() {
  HttpCode c = HttpCode.ok;
  print(c.value);
  print(c.isSuccess);
}

Step 3 - Switch exhaustiveness

String label(Priority p) {
  return switch (p) {
    Priority.low => 'Low',
    Priority.medium => 'Medium',
    Priority.high => 'High',
  };
}

• Prefer switch on enums so new values force you to update call sites (analyzer helps).

Practice tasks

• Add Theme { light, dark } and a function String cssClass(Theme t).
• Add an enum Role with a int level field and compare two roles by level.