Branches

1. hooks-only - Only React hooks, exchange is made on the server
2. master - Redux-Saga, exchange is made on the client (not real-world)

Install & run the project:

1. yarn or npm i
2. yarn server or npm run server
3. yarn start or npm start

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About API

API is just a simple exchangeratesapi.io proxy, it runs on port 9000 and will print console logs to track what is happening.
There is a 2s delay in each API response (to test the real-world usage on a slow connection)

About React app

(hooks branch) - Most lightweight (just Hooks) solution to the problem.
We don't do the exchange operation on the client, the client should only provide an interface to enter the currencies and amount.
App will re-fetch FX rates every 10s for current base currency (main/top Pocket).
On every currency change in the main Pocket, app will cancel old requests, reset the timer and fetch new FX rates for the new base currency.

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Todo:

• Complex state management? (Do we need redux in this project? probably not) - done in master
• Better money handling (Dinero etc.) - on the server
• Tests (react-testing-library + E2E Cypress) - done in master
• Better amount length control (wider input?)
• Live data (WebSockets?) to update accounts balances and fx rates
• Swipe left/right to change the currency (on touch devices)
• Display exchange rate of 1 unit