factory pattern

Ruby code posted
created at 29 Mar 20:04, updated at 31 Mar 12:00

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class Vehicle
  def initialize(options); @options = options; end
  def self.factory(options)
    options.delete("class").new(options)
  end
end
class Bicycle < Vehicle;
  def honk; "Ring Ring"; end
end
class Train < Vehicle;
  def honk; @options["tone"] || "Woooooooo Woooooooo"; end
end
irb> Vehicle.factory("class" => Bicycle).honk
=> "Ring Ring"
irb> Vehicle.factory("class" => Train, "tone" => "squeek").honk
=> "squeek"
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