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DDD_and_calisthenics

Examples with calisthenics implementations

Currency conversion

Convert an amount from one currency to another.

Examples

When I want to convert 10 EUR into EUR by rounding to cents, I get 10 EUR.

Knowing that the exchange rate of EUR to USD is 1.1329, When I want to convert 10 EUR into USD by rounding to cents, I get 11.33 USD.

Knowing that the exchange rate of EUR to JPY is 128.121, When I want to convert 1281 JPY into USD by rounding up to unit, I get 11.33 USD.

#Refactoring recipes

Extract a Value Type

  1. Extract method from primitive value
  2. Move to a new target class
  3. Convert from static to non-static
  4. Extract primitive value as field initialized in constructor
  5. In constructor, extract parameter for the value

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