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Write a Ruby gem to perform currency conversion and arithmetics with different currencies (we know there are already gems for that, but for the sake of the exercise implement your own ;) ). The expected features and the usage of the gem should be something like this: # Configure the currency rates with respect to a base currency (here EUR): Money.conversion_rates('EUR', { 'USD' => 1.11, 'Bitcoin' => 0.0047 }) # Instantiate money objects: fifty_eur = Money.new(50, 'EUR') # Get amount and currency: fifty_eur.amount # => 50 fifty_eur.currency # => "EUR" fifty_eur.inspect # => "50.00 EUR" # Convert to a different currency (should return a Money # instance, not a String): fifty_eur.convert_to('USD') # => 55.50 USD # Perform operations in different currencies: twenty_dollars = Money.new(20, 'USD') # Arithmetics: fifty_eur + twenty_dollars # => 68.02 EUR fifty_eur - twenty_dollars # => 31.98 EUR fifty_eur / 2 # => 25 EUR twenty_dollars * 3 # => 60 USD # Comparisons (also in different currencies): twenty_dollars == Money.new(20, 'USD') # => true twenty_dollars == Money.new(30, 'USD') # => false fifty_eur_in_usd = fifty_eur.convert_to('USD') fifty_eur_in_usd == fifty_eur # => true twenty_dollars > Money.new(5, 'USD') # => true twenty_dollars < fifty_eur # => true For the purpose of this exercise, when implementing equality, you can consider two monetary amounts as equal if they agree up to the cents. You might want to namespace your gem not to conflict with existing gems with the same name. Keep it simple, no need to support other features rather than these. The clearer your code the better. But please write tests or documentation whenever it makes sense. Think as if other people will have to use your gem or contribute to it.
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Software Engineer Ruby

Interviewed at Dawanda

3.6★
Jun 16, 2017

Write a Ruby gem to perform currency conversion and arithmetics with different currencies (we know there are already gems for that, but for the sake of the exercise implement your own ;) ). The expected features and the usage of the gem should be something like this: # Configure the currency rates with respect to a base currency (here EUR): Money.conversion_rates('EUR', { 'USD' => 1.11, 'Bitcoin' => 0.0047 }) # Instantiate money objects: fifty_eur = Money.new(50, 'EUR') # Get amount and currency: fifty_eur.amount # => 50 fifty_eur.currency # => "EUR" fifty_eur.inspect # => "50.00 EUR" # Convert to a different currency (should return a Money # instance, not a String): fifty_eur.convert_to('USD') # => 55.50 USD # Perform operations in different currencies: twenty_dollars = Money.new(20, 'USD') # Arithmetics: fifty_eur + twenty_dollars # => 68.02 EUR fifty_eur - twenty_dollars # => 31.98 EUR fifty_eur / 2 # => 25 EUR twenty_dollars * 3 # => 60 USD # Comparisons (also in different currencies): twenty_dollars == Money.new(20, 'USD') # => true twenty_dollars == Money.new(30, 'USD') # => false fifty_eur_in_usd = fifty_eur.convert_to('USD') fifty_eur_in_usd == fifty_eur # => true twenty_dollars > Money.new(5, 'USD') # => true twenty_dollars < fifty_eur # => true For the purpose of this exercise, when implementing equality, you can consider two monetary amounts as equal if they agree up to the cents. You might want to namespace your gem not to conflict with existing gems with the same name. Keep it simple, no need to support other features rather than these. The clearer your code the better. But please write tests or documentation whenever it makes sense. Think as if other people will have to use your gem or contribute to it.

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