Struct using keyword args (actually, really just a hash).

kstruct.rb

class KStruct

  def self.new *attr_names
    Class.new(Struct) do
      attr_accessor *attr_names
    end
  end

  class Struct
    def initialize args
      args.each do |key,value|
        public_send "#{key}=", value
      end
    end
  end

end

klass = KStruct.new *%i| name age gender |
puts klass.new(name: 'Marty', age: 17, gender: 'Male').inspect

# => #<#<Class:0x007ffb89a74ea0>:0x007ffb89a74bd0 @name="Marty", @age=17, @gender="Male">