CashRegister
	Properties
		PriceList Array of objects the individual objects the properties specified in the product class below
		MoneyReceived
		Last Item Scanned
		CurrentTransaction - Transaction
		PriorTransactions - Array of Transaction objects
		Current cash in the cash register - Money object
		InTransaction boolean
		CurrentTransactionID
		CurrentTransactionDateTime
	Methods
		Intialize(PriceList String, Money object, salestax number) {
			split the pricelist string on commas
			loop through the list three at a time and store them into product objects and push into array of pricelist
		}
		Total() {
			sum the total amounts in the cash register by calling total on the money object and return
		}
		StartTransaction() {
			InTransaction = true
			CurrentTransaction = new Transaction
			CurrentTransactionID++
			CurrentTransactionDateTime = now()
		}
		EndTransaction() {
			InTransaction = false
			PriorTransactions.push(CurrentTransaction)
			calculate total and return
		}
		ScanItem(SKU string) {
			CurrentTransaction.Add(CurrentTransactionID, TimeStamp, SKU)
			FindItem using SKU on pricelist
			Add Item to list and update quantity
		}

Money - Class consisting of number bills of a particular type
Properties
	cash array of money units
Methods
	Total() {
		add up the array using value * quantity above and return total
	}
	Add(amounts) {
		take an array of amounts and matches to the cash array and subtracts the appropriate quantity from the corresponding index
	}
	Subtract(amounts) {
		figures out the least number of units that need to be substracted and subtracts from the corresponding index
	}

MoneyUnit - Class contains a cash type and its value and the quantity
	Properties
		var cashtype = string
		var value = number
		var quantity = number

PriceList - Class containing array of product objects
	Properties
		Array of Products

Product - Class for objects stored in the price list on the cash register
	Properties
		Product Name
		SKU - Product ID
		Price per unit
		Taxable?

Transaction
	Properties
		Transaction ID
		Time Stamp
		Scanned Products Array

Cashier

Customer

Receipt
	Properties
		Product Name
		Number of items purchased
		Price
		Total

Cashier Report
	Properties
		ID
		Number of items purchased
		Total