Гист для статьи "Еще раз о паттернах проектирования в Javascript es6"

prototype-pattern.js

class Prototype {
  setOption(key, val) {
    this[key] = val;
  }

  clone() {
    const clone = new Prototype();
    const keys = Object.keys(this);

    keys.forEach((k) => clone.setOption(k, this[k]));
    return clone;
  }
}

// Code for the testing
const testing = () => {
  const proto1 = new Prototype();
  proto1.setOption('option1', '1');
  const clone1 = proto1.clone();
  clone1.setOption('option2', '2');
  const clone2 = clone1.clone();
  clone2.setOption('option3', '3');

  console.log(proto1, clone1, clone2);
};
testing();