S.O.L.I.D Principles for JS with examples, see more at https://medium.com/p/db95b44e82e

SOLID_OCPExample.js

class Sizes {
  constructor() {
    this.data = ["small", "medium", "big"];
    return this.data;
  }
}

class Sandwich {
  constructor({ name, size, price } = {}) {
    this.setName(name);
    this.setSize(size);
    this.setPrice(price);
  }

  setName(name) {
    this.name = name;
  }

  setPrice(price) {
    this.price = price;
  }

  setSize(size) {
    const sizesList = new Sizes();
    if (sizesList.includes(size)) {
      this.size = size;
    }
  }
}

const run = () => {
  const TunaSandwich = new Sandwich({
    name: "Tuna Sandwich",
    size: "medium",
    price: 2.5,
  });

  console.log(TunaSandwich);
};

run();