gistfile1.rb

class Demo
  METHODS = ["one","two","three","four"]

  class << self

    METHODS.each do |name|
      define_method("method_#{name}") do |arg|
        puts "this method is named method_\"#{name}\" and you gave me the arg \"#{arg}\""
      end
    end

  end
end

Demo.method_one("boo")