Sandi Metz COC

shock.rb

# Source: https://www.youtube.com/watch?v=f5I1iyso29U&t=23m44s
class Shock
  def cost(type)
    case type
    when :front
      FrontShockCost.new.compute
    when :rear
      RearShockCost.new.compute
    when :lefty
      LeftyShockCost.new.compute
    else
      ShockCost.new.compute
    end
  end
end

shock_refactored.rb

class Shock
  def cost(type)
    "#{type.to_s.titleize}Shock".constantize.new.compute
  end
end