Ruby Attr Antipattern timing

gistfile1.rb

class Demo
  def initialize(something)
    @something = something
  end

  def based_on_something
    @something * 2
  end
end

require 'benchmark'
demo = Demo.new(5)
Benchmark.measure do
  1.upto(5000000) do
    demo.based_on_something
  end
end

1.9.3p327 :012 > Benchmark.measure do
1.9.3p327 :013 >       1.upto(5000000) do
1.9.3p327 :014 >           demo.based_on_something
1.9.3p327 :015?>       end
1.9.3p327 :016?>   end
 =>   2.140000   0.010000   2.150000 (  2.143686)

class Demo
  def initialize(something)
    @something = something
  end

  def based_on_something
    something * 2
  end

  private
  attr_reader :something
end

require 'benchmark'
demo = Demo.new(5)
Benchmark.measure do
  1.upto(5000000) do
    demo.based_on_something
  end
end

1.9.3p327 :015 > Benchmark.measure do
1.9.3p327 :016 >       1.upto(5000000) do
1.9.3p327 :017 >           demo.based_on_something
1.9.3p327 :018?>       end
1.9.3p327 :019?>   end
 =>   2.620000   0.000000   2.620000 (  2.628891)