shopCart.js

class ShoppingCart {
  constructor () {
    this._total = 0;
    this._item = {};    
  }
  
  addItem(itemName, quantity, price) {
    this._total += price;
    //confirm if you should use dot notation or bracket notation to access itemName.
    item.[itemName] = quantity; 
  }
  
  removeItem(itemName, quantity, price) {
    if (quantitiy > this._quanity) {
      
    item.itemName = null;
    this.total -= price;
  }
  
  checkout(cashPaid) {
    if (cashPaid < this._price) {
     return "Cash paid not enough";
    } else {
    return this._price - cashPaid;
    }
}

class Shop extends ShoppingCart {
  constructor (name) {
    super(name);
    this._quantity = 100;
  }
  
  removeItem() {
    this._quantity -= 1;
  }
}