kompakt-solutions/currency-converter

require 'rest-client'
require 'json'

module Currency

  def self.exchange currency, currency_destination, quantity
    begin
      res = RestClient.get "http://api.fixer.io/latest?base=#{currency}&symbols=#{currency_destination}"
      value = JSON.parse(res.body)['rates'][currency_destination]
      return (value * quantity).round(2)
    rescue RestClient::ExceptionWithResponse => e
      return "Conversion error: #{e}"
    end
  end

end