ruby #inject vs. #sum

sum_benchmark.rb

data = (1..1_000).to_a

measure "sum" do
  data.sum { |n| n }
end

measure "inject" do
  data.inject(0) { |sum, element| sum + element}
end


=begin 


=============
Date: August 06, 2010  

System Information
------------------
    Operating System:    Mac OS X 10.6.4 (10F569)
    CPU:                 Intel Core i7 2.66 GHz
    Processor Count:     2
    Memory:              4 GB
    ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-darwin10.4.0]

"inject" is up to 48% faster over 1,000 repetitions
---------------------------------------------------

    inject    0.0993571281433105 secs    Fastest
    sum       0.194322109222412  secs    48% Slower

=end