'use strict';

class Rect {

toString() {

return `[${this.x}, ${this.y}, ${this.width}, ${this.height}]`;

}

}

const p1 = { x: 10, y: 20, width: 50, height: 50 };

Object.setPrototypeOf(p1, Rect.prototype);

//p1.__proto__ = Rect.prototype;

console.log(p1);

console.log(p1.toString());

console.log(`${p1}`);