https://github.com/dmytrovasin/vending_machine

https://github.com/dmytrovasin/vending_machine

Last synced: 8 months ago
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• Host: GitHub
• URL: https://github.com/dmytrovasin/vending_machine
• Owner: DmytroVasin
• License: mit
• Created: 2021-08-13T14:28:59.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2021-08-14T05:52:01.000Z (about 4 years ago)
• Last Synced: 2025-01-02T01:42:28.894Z (9 months ago)
• Language: Ruby
• Size: 302 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt
  • Code of conduct: CODE_OF_CONDUCT.md

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README

          
## Title:

Virtual vending machine application which emulates the goods buying operations and change calculation.

### Features of vending machine:

- Allow user to select a product from a provided machine's inventory

- Allow user to insert coins into a vending machine

- Once the product is selected and the appropriate amount of coins inserted - it returns the product

- It return change (coins) if inserted too much

- Change is returned with the minimum amount of coins possible (Algorithm)

- It notify the customer when the selected product is out of stock

- It return inserted coins in case it does not have enough change

## Screenshot:

![A representation of how CCBill Webhooks work](https://raw.githubusercontent.com/DmytroVasin/vending_machine/master/images/img.png)

## To run programm:

`bin/vm`

## To run tests:

`rspec spec`

## To create a gem:

`rake install`

### Implmentation tricks:

Inside `Inventory` we do next:

1. I used HashTable to be able to have an access in O(1)

2. Add `value` (Integer) field. In a such way we do not need to use float numbers in exchange algo. (Moreover, usage of float numbers in price calculation is restricted.)

### Possible improvments:

1. Data tranfering format between Services is not specified.

1. Incorrect data structure was picked for keeping coins. Because of that we receive N+1 request per each Coin

2. Exchange Algo works with specific (non optimal structure - Hash)

3. Tests have alot of duplicated lines!

4. Client can't add money inside buying process.

### How to bundle it:

To pack:

`git bundle create vending_machine.bundle HEAD master`

To Re-pack:

`git clone vending_machine.bundle -b master directory-name`