Application that authorizes a transaction for a specific account following a set of predefined rules
Install dependeces
Run yarn or npm install to add project dependeces
Run Application as development
Run yarn dev or npm run dev
Provide a json lines as input in the stdin, and receive
a json line output for each one.
Sample usage
$ cat operations
{ "account": { "activeCard": true, "availableLimit": 100 } }
{ "transaction": { "merchant": "Burger King", "amount": 20, "time": "2019-02-13T10:00:00.000Z" } }
{ "transaction": { "merchant": "Habbib's", "amount": 90, "time": "2019-02-13T11:00:00.000Z" } }
$ authorize < operations
{ "account": { "activeCard": true, "availableLimit": 100 }, "violations": [] }
{ "account": { "activeCard": true, "availableLimit": 80 }, "violations": [] }
{ "account": { "activeCard": true, "availableLimit": 80 }, "violations": [ "insufficient-limit" ] }
Violations rules
-
Once created, the account should not be updated or recreated:
account-already-initialized. -
The transaction amount should not exceed available limit:
insufficient-limit -
No transaction should be accepted when the card is not active:
card-not-active -
There should not be more than 3 transactions on a 2 minute interval:
high-frequency-small-interval -
There should not be more than 2 similar transactions (same amount and merchant) in a 2 minutes interval:
doubled-transaction
Run as production
Run yarn build or npm run build
Run tests Application
Run yarn test or npm run test to code test
Stack Used
- Node.js - To develop the application
- Sucrase/Babel - To compile
- Nodemon - To auto reload application
- ESlint / Prettier - To identifying, reporting and auto fix on patterns in JavaScript
- Jest - To test the code