Ruby benchmark

sample1.rb

require 'benchmark'

n = %w(a b c d e f g h i j k l m n o p q r s t u v w x y z)
Benchmark.bm do |bm|
  bm.report("each_with_index:") {
    100000.times do
      n.each_with_index do |o,i|
        x = [o, i]
      end
    end
  }
  bm.report("each           :") {
    100000.times do
      i = 0
      n.each do |o|
        x = [o, i]
        i += 1
      end
    end
  }
end

=begin
# rbenv shell 1.8.7-p374
      user     system      total        real
each_with_index:  1.690000   0.000000   1.690000 (  1.687167)
each           :  1.190000   0.000000   1.190000 (  1.196548)

# rbenv shell 1.9.3-p448
       user     system      total        real
each_with_index:  0.450000   0.000000   0.450000 (  0.447725)
each           :  0.430000   0.000000   0.430000 (  0.433347)

# rbenv shell 2.0.0-p247
       user     system      total        real
each_with_index:  0.390000   0.000000   0.390000 (  0.390246)
each           :  0.350000   0.000000   0.350000 (  0.347369)
=end