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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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