Ruby sum benchmark

bench.rb

require 'benchmark'

huge_array = (1..10000000).to_a

Benchmark.bmbm do |x|
  puts "Adding all numbers"
  x.report(:sum) { huge_array.sum }
  x.report(:plus_equal) { sum = 0; huge_array.each {|i| sum += i }; sum}
  x.report(:inject) { huge_array.inject(:+) }
  x.report(:inject_block) { huge_array.inject(0) {|memo, i| memo + i} }
end

Benchmark.bmbm do |x|
  puts "Adding only even numbers"
  x.report(:sum) { huge_array.sum {|i| i.even? ? i : 0} }
  x.report(:plus_equal) { sum = 0; huge_array.each {|i| sum += i if i.even? }; sum}
  x.report(:inject) { huge_array.inject(0) {|memo, i| i.even? ? memo + i : memo} }
end

result.txt

Adding all numbers
Rehearsal ------------------------------------------------
sum            0.025731   0.000095   0.025826 (  0.025985)
plus_equal     0.484651   0.003383   0.488034 (  0.504850)
inject         0.021083   0.000081   0.021164 (  0.021441)
inject_block   0.585306   0.002565   0.587871 (  0.602357)
--------------------------------------- total: 1.122895sec

                   user     system      total        real
sum            0.024194   0.000061   0.024255 (  0.024360)
plus_equal     0.460036   0.001802   0.461838 (  0.470530)
inject         0.023195   0.000122   0.023317 (  0.023391)
inject_block   0.621789   0.002185   0.623974 (  0.635282)
Adding only even numbers
Rehearsal ----------------------------------------------
sum          0.672182   0.004191   0.676373 (  0.701799)
plus_equal   0.695669   0.005810   0.701479 (  0.721717)
inject       0.992774   0.008890   1.001664 (  1.064697)
------------------------------------- total: 2.379516sec

                 user     system      total        real
sum          0.756707   0.005589   0.762296 (  0.801659)
plus_equal   0.705938   0.003404   0.709342 (  0.725457)
inject       0.839872   0.006637   0.846509 (  0.874628)