hash vs method.rb

Benchmark.bm do |x|
  hash = {:foo => "foo"}
  class Item
    def initialize
      @foo = "foo"
    end
    def foo
      @foo
    end
  end
  item = Item.new
  x.report("hash") { 1_000_000.times { hash[:foo] } }
  x.report("item") { 1_000_000.times { item.foo } }
end


      user     system      total        real
hash  0.200000   0.000000   0.200000 (  0.200694)
item  0.230000   0.000000   0.230000 (  0.225771)