class Configuration {
  static appName = "MyApp";
  static version = "1.0.0";
  static #apiKey = "secret-key-123"; // Private static!

  static getAppInfo() {
    return `${Configuration.appName} v${Configuration.version}`;
  }
}

console.log(Configuration.appName); // "MyApp"

class Circle:
    pi = 3.14159
    circle_count = 0

    def __init__(self, radius):
        self.radius = radius
        Circle.circle_count += 1

    @classmethod
    def from_diameter(cls, diameter):
        return cls(diameter / 2)

    @staticmethod
    def calculate_area(radius):
        return Circle.pi * radius ** 2