robinv85 / arda-dreamland

My solution to Arda's "Dreamland" code assignment for a job application

Arda Dreamland

My solution to Arda's "Dreamland" code assignment for a job application as software engineer.

Steps taken

• Bootstrapped initial project structure with Fastify-CLI
• Added 4 Endpoints with schema's for validation:
  • POST /tokens : user has won some amount of DREAM token at a particular time of a day (can be fractional tokens)
  • GET /tokens?user_id={user_id} : returns the history of tokens a user has won for the current day so far _ GET /usd?user_id={user_id} : returns the history of USD amounts a user has won till now (since start of current day)
  • GET /stats?user_id={user_id} : returns the stats: sum of tokens won on the current day so far and the total value of USD a user has in his account
• Replaced TAP with Jest and added some API tests (failing first to spec the API endpoints and responses)
• Added TypeORM using Fastify-TypeORM plugin, with data models for users, tokens and usd ledgers (using auto sync without migrations)
• Implemented logic for API endpoints & fixed tests with mocked database
• Fixed issue with TypeORM entities and auto-sync (moved all stats into one Accounts entity for simplicity)
• Added Decimal.js to fix rounding issues with floating point numbers

Available Scripts

In the project directory, you can run:

npm run dev

To start the app in dev mode.
Open http://localhost:3000 to view it in the browser.

npm start

For production mode

npm run test

Run the test cases.