splat.rb

require 'pp'

class Foo
  def parameterfest(one, two, subopts, opts)
    puts "One: #{one}"
    puts "Two: #{two}"
    puts "Subopts: #{subopts.pretty_print_inspect}"
    puts "Opts: #{opts.pretty_print_inspect}"
  end
end

class PFestParameters
  def initialize
    yield self
  end

  def one(o)
    @one = o
  end

  def two(t)
    @two = t
  end

  def sub(opts)
    @sub = opts
  end

  def opts(opts)
    @opts = opts
  end

  def to_a
    [@one, @two, @sub, @opts]
  end
end

params = PFestParameters.new do |p|
  p.one "1"
  p.two "2"
  p.sub :a => 'A', :b => 'B'
  p.opts :z => 'Z'
end

foo = Foo.new
foo.parameterfest(*params)