betterflowers / jspractice

Tasking:
1    计算条形码出现对应次数
2  根据list分析条形码对应的详细商品信息
3  计算商品总价
4  格式化输出
5 打印出清单字符串

上下文图：

总体：
P:2h
D:3.5h
C:做的过程有一些不熟悉地方卡住，时间越晚越紧张，越容易乱
A:需要加强js基础知识，还要加强编程思维

Requirement

A cash register (POS) system is used in the store for settlement of the store. This cashier will settle and print the receipt (Receipt) according to the item(Item) in the customer's shopping cart (Cart) at the time of settlement.

We need to implement a function called printReceipt, which can input the data of the specified format as a parameter and then output the text of the receipt in the browser console.

This time, the input will be an array of barcodes (string). For example:

[
  'ITEM000000',
  'ITEM000000',
  'ITEM000000',
  'ITEM000000',
  'ITEM000000',
  'ITEM000001',
  'ITEM000001',
  'ITEM000004'
]

Then the output should be

***<store earning no money>Receipt ***
Name: Coca-Cola, Quantity: 5, Unit price: 3 (yuan), Subtotal: 15 (yuan)
Name: Sprite, Quantity: 2, Unit price: 3 (yuan), Subtotal: 6 (yuan)
Name: Battery, Quantity: 1, Unit price: 2 (yuan), Subtotal: 2 (yuan)
----------------------
Total: 23 (yuan)
**********************

Suppose that our database is as follows:

[
   {
      barcode: 'ITEM000000',
      name: 'Coca-Cola',
      price: 3
    },
    {
      barcode: 'ITEM000001',
      name: 'Sprite',
      price: 3
    },
    {
      barcode: 'ITEM000002',
      name: 'Apple',
      price: 5
    },
    {
      barcode: 'ITEM000003',
      name: 'Litchi',
      price: 15
    },
    {
      barcode: 'ITEM000004',
      name: 'Battery',
      price: 2
    },
    {
      barcode: 'ITEM000005',
      name: 'Instant Noodles',
      price: 4
    }
]

Principal

1. Please draw context diagram.
2. Please declare all the methods according to your diagram.
3. Please implement the function according to the context diagram
4. Please repeat step 3 until all functions are implemented.