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Money Problem

This kata comes from Saleem Siddiqui 's book

Learning Test Driven Development

What's the problem ?

We have to build a spreadsheet to manage money in more than one currency : perhaps to manage a stock portfolio ?

Stock Stock exchange Shares Share Price Total
IBM NASDAQ 100 124 USD 12400 USD
BMW DAX 400 75 EUR 30000 EUR
Samsung KSE 300 68000 KRW 20400000 KRW

To build it, we'd need to do simple arithmetic operations on numbers :

5 USD x 2 = 10 USD
4002 KRW / 4 = 1000.5 KRW

// convert
5 USD + 10 EUR = 17 USD
1 USD + 1100 KRW = 2200 KRW
  • We can use this table to determine exchange rates :
From To Rate
EUR USD 1.2
USD EUR 0.82
USD KRW 1100
KRW EUR 0.0009
EUR KRW 1344
KRW EUR 0.00073

List of Features to implement

We have already started the implementation by using TDD. We have discovered examples that helped us drive our implementation.

Money Calculator :
✅ 10 EUR x 2 = 20 EUR
✅ 4002 KRW / 4 = 1000.5 KRW
✅ 5 USD + 10 USD = 15 USD

Bank implementation :
✅ Determine exchange rate based on the currencies involved (from -> to)
✅ Improve the implementation of exchange rates
✅ Allow exchange rates to be modified

Iterations