A different version of https://gist.github.com/813190

shifting-vs-offset

require 'benchmark'

array_iterate = (1..10_000_000).to_a
array_shift   = array_iterate.dup

Benchmark.bmbm do |test|

  # this assumes you can destroy the given array
  test.report 'using shift' do
    for i in array_shift
      array_shift.shift
    end
  end

  test.report 'using an offset' do
    for i in array_iterate
      array_iterate[i-1]
    end
  end

  test.report 'just accessing an index' do
    for i in array_iterate
      array_iterate[i]
    end
  end

  test.report 'shifting through duped array' do
    new_array = array_iterate.dup
    for i in new_array
      new_array.shift
    end
  end

end