text: class Circle {
      constructor(radius) {
          this.radius = radius;
      }
  
      getArea() {
          return this.radius ** 2 * Math.PI;
      }
  }
  
  console.log(Circle.prototype); // work in the browser
  
  const c = new Circle(5);
  
  console.log(Object.getPrototypeOf(c).hasOwnProperty('getArea'));
  
  console.log(Circle.prototype == Object.getPrototypeOf(c));