define_methodで可変長引数のメソッドを定義する

define_method_with_variable_arguments.rb

class Test
  def self.method_missing(name, *args)
    klass = class << self; self end
    klass.class_eval do
      define_method(name) do |*params|
        p params
      end
    end
    __send__(name, *args)
  end
end

Test.hoge(1, 2, 3)
#  => [1, 2, 3]
Test.hoge(1, 2)
#  => [1, 2]
Test.hoge(1)
#  => [1]
Test.hoge
#  => []