gistfile1.rb

#!/usr/bin/env ruby

class Foo
  attr_accessor :bar, :baz, :florp

  def initialize(properties = {})
    properties.each do |key, value|
      self.send("#{key}=", value)
    end
  end
end

foo = Foo.new(:bar => "rab", :baz => "zab")

puts "foo.bar: #{foo.bar}"
puts "foo.baz: #{foo.baz}"
puts "foo.florp: #{foo.florp}"