Benchmark to compare ruby while and for loop, inspired by http://rubylearning.com/blog/2013/06/19/how-do-i-benchmark-ruby-code/

benchmark.rb

require 'benchmark'

iterations = 10_000

Benchmark.bm(27) do |bm|
  bm.report('for loop') do
    iterations.times do
      for iter in 0..1_000
      end
    end
  end

  bm.report('while loop') do
    iterations.times do
      iter = 0
      while iter < 1_000
        iter += 1
      end
    end
  end
end