Ruby enumerators performance

enumerators_performance.rb

require 'benchmark/ips'

COUNT = 500000


Benchmark.ips do |x|
  x.report('Enumerable') do
    total = 0
    COUNT.times do |i|
      total += i
    end
  end

  x.report('Enumerator') do
    total = 0
    enumerator = COUNT.times

    while true
      begin
        total += enumerator.next
      rescue StopIteration
        break
      end
    end
  end
end

Results with Ruby 2.4.0

Enumerable     37.073  (± 5.4%) i/s -    186.000  in   5.030412s
Enumerator      1.588  (± 0.0%) i/s -      8.000  in   5.040230s