iterators_bench.rb

require 'benchmark/ips'

ARRAY = (1..10).to_a

Benchmark.ips do |x|
  x.report('each') { sum = 0; ARRAY.each { |n| sum += n }; sum }
  x.report('reduce') { ARRAY.reduce(0, :+) }
end

Calculating -------------------------------------
                each    77.150k i/100ms
              reduce    69.590k i/100ms
-------------------------------------------------
                each      1.422M (± 5.2%) i/s -      7.098M
              reduce      1.198M (± 7.2%) i/s -      5.985M