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// スーパークラス
function Ellipse(a, b) {
  this.a = a;
  this.b = b;
}

Ellipse.prototype.getArea = function() {
  return Math.PI * this.a * this.b;
};

Ellipse.prototype.toString = function() {
  return `Ellipse ${this.a} ${this.b}`;
}

var ellipse = new Ellipse(5, 3);

console.log(ellipse.getArea());
console.log(ellipse.toString());

// サブクラス
function Circle(r) {
  this.a = r;
  this.b = r;
}
Circle.prototype = Object.create(Ellipse.prototype, {
  constructor: {
    configurable: true,
    enumerable: true,
    value: Circle,
    writable: true
  }
})
Circle.prototype.toString = function() {
  return `Circle ${this.a} ${this.b}`;
}

var circle = new Circle(2);

console.log(circle);
console.log(circle.getArea());
console.log(circle.toString());

// サブクラスその２
function Circle2(r) {
  Ellipse.call(this, r, r);
}
Circle2.prototype = Object.create(Ellipse.prototype, {
  constructor: {
    configurable: true,
    enumerable: true,
    value: Circle,
    writable: true
  }
});
Circle2.prototype.toString = function() {
  return `Circle ${this.a} ${this.b}`;
}

var circle2 = new Circle2(3);
console.log(circle2.getArea());
console.log(circle2.toString());

// サブクラスその3
// 擬古典的継承
function Circle3(r) {
  Ellipse.call(this, r, r);
}
Circle3.prototype = Object.create(Ellipse.prototype, {
  constructor: {
    configurable: true,
    enumerable: true,
    value: Circle,
    writable: true
  }
});
Circle3.prototype.toString = function() {
  var str = Ellipse.prototype.toString.call(this);
    return str.replace('Elipse', 'Circle');
}

var circle3 = new Circle3(10);
console.log(circle3.getArea());
console.log(circle3.toString());

#cnt