Ruby extend performance test

bm_extend.rb

# gem install benchmark-ips
 
require 'rubygems'
require 'benchmark/ips'
 
module Mixin
  def foo; 42; end
end
 
class SubclassArray < Array
  include Mixin
end
 
Benchmark.ips do |bm|
  bm.report("array") do
    Array.new.size
  end
 
  bm.report("extend") do
    a = Array.new
    a.extend Mixin
    a.foo
  end
 
  bm.report("include") do
    a = SubclassArray.new
    a.foo
  end
end

ruby bm_extend.rb 
Calculating -------------------------------------
               array     95387 i/100ms
              extend     31050 i/100ms
             include     89500 i/100ms