Cacher is the code snippet organizer for pro developers

class ShoppingCart {
  constructor() {
    this.quantity = 100;
    this.total = 0;
    this.items = {};
  }
  
  addItem(item_name, quantity, price) {
      this.total += price * quantity;
      this.items[item_name] = quantity
  }
  
  removeItem(item_name, quantity, price)  {
    if(this.items[item_name] in this.items) {
      return 'Item is not in cart';
    } else {
      this.total -= price * quantity;  
      this.items[item_name] = this.items[item_name] - quantity; 
    } 
  }
  
  checkout(cash_paid) {
    if(cash_paid < this.total) {
      return 'Cash paid not enough';
    } else {
      return cash_paid - this.total;
    }
  }
}

class Shop extends ShoppingCart {
  removeItem() {
    this.quantity -= 1;
    return this.quantity;
  }
}