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class Rectangle {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
}

const p = new Rectangle();

/* -------- クラス式 ---------- */
// 名前なし
let Rectangle = class {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
};
console.log(Rectangle.name);
// 出力: "Rectangle"

// 名前つき
let Rectangle = class Rectangle2 {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
};
console.log(Rectangle.name);
// 出力: "Rectangle2"