module RunbyPace
  class PaceUnits
    def self.description(units)
      descriptions[units]
    end

    def self.distance_conversion_factor(units)
      distance_conversion_factors[units]
    end

    private

    def self.descriptions
      { km: 'Kilometers', mi: 'Miles' }
    end

    def self.distance_conversion_factors
      { km: 1.0, mi: 1.612903225806452 }
    end
  end
end