[ES7] Getter and setter with Object.freeze

We want to only freeze the private variable when we get it and set it:

class Cart {
  #items;
  constructor(items = []) {
    this.value = items;
  }
  set value(items) {
    this.#items = Object.freeze(items);
  }
  get value() {
    return Object.freeze(this.#items);
  }
  get count() {
    return this.value.length;
  }
  add(item) {
    this.value = [...this.value, item];
  }
  remove(id) {
    this.value = this.value.filter((item) => item.id !== id);
  }
}
const cart = new Cart();
const hotdog = { id: '🌭', name: 'Posh Dog', price: 399 };
cart.add(hotdog);
console.log(cart.value);