BetterStruct

better_struct.rb

class BetterStruct < Struct
  class << self

    def new(*required, **properties)
      super(*(required + properties.keys)) do
        define_singleton_method(:_default_values) do
          properties
        end
      end
    end

    def default_value_for(key)
      _default_values.fetch(key) do
        raise ArgumentError, "#{key} is required argument"
      end
    end
  end

  def initialize(**options)
    super(*(_get_struct_values_from(options)))
  end

  def _get_struct_values_from(options)
    members.map { |key|
      options.fetch(key) {
        self.class.default_value_for(key)
      }
    }
  end
end