extractor.rb

extractor.rb

module Extractable
  module Initializer
    def initialize *args
      self.class.class_eval do
        define_method(:extract) do |&block|
          if block
            block.(*args)
          else
            args
          end
        end

        define_method(:match) do
        end
      end
      super(*args)
    end
  end

  def self.included klass
    klass.instance_eval do
      self.prepend Initializer
    end
  end
end

class Student
  include Extractable

  def initialize a, b
  end
end

s = Student.new("piyo", "tyun")

z = "nya"

s.extract do |x, y|
  p(x * 2 + y * 2 + z * 2)
end

p s.extract

#s.match do
#  pattern ["hiyo", "tyun"].then do end
#  pattern ["piyo", :x].then do end
#  pattern [_, _].then do end
#end