OwnMemo VendingMachine

It is my own memo.

The solidity is too difficult.
So, try creating vending machines with javascript and try smartContract understanding.

class Item {
  constructor({name, price}) {
    this.name = name;
    this.price = price;
  }
}

class VendingMachine {
  constructor() {
    this.stockMap = new Map();
    this.inputMoney = 0;
  }

  setItemList({itemList}) {
    itemList.forEach((item, itemId) => {
      this.stockMap.set(itemId, item);
    });
  }

  isInputedMoney({moneyNum}) {
    this.inputMoney = moneyNum;
    console.log(`input ${this.inputMoney} Yen`);
  }

  isPushedBtn({itemId}) {
    if(this.stockMap.has(itemId) !== true) {
      console.log(`not have item`);
      return;
    }
    const buyItem = this.stockMap.get(itemId);
    if(this.inputMoney < buyItem.price) {
      console.log(`insufficient money.`);
      return;
    }
    console.log(`Buy ${buyItem.name}`)
  }
}

//make Item
const cola = new Item({name: "Cola", price: 100});
const cider = new Item({name: "Cider", price: 100});
const orangeJuice = new Item({name: "OrangeJuice", price: 100});

//make vendingMachine
const vendingMachine = new VendingMachine();
vendingMachine.setItemList({itemList: [cola, cider, orangeJuice]});

//run code
vendingMachine.isInputedMoney({moneyNum: 100});
vendingMachine.isPushedBtn({itemId: 1})