Benchmark ruby loop

ruby_loop.rb

require "benchmark"

n = 5000000

Benchmark.bmbm do |x|
  x.report("while:")      { i = 1; while i < n do; a = "1 and #{i}"; i += 1; end }
  x.report("for loop:")   { for i in 1..n; a = "1 and #{i}"; end }
  x.report("times:")      { n.times do |i|   ; a = "1 and #{i}"; end }
  x.report("upto:")       { 1.upto(n) do |i| ; a = "1 and #{i}"; end }
  x.report("until:")      { i = 1; until i > n do; a = "1 and #{i}"; i += 1; end }
  x.report("each:")       { (1..n).each do |i|; ; a = "1 and #{i}"; end }
end

## RESULTS
# Rehearsal ----------------------------------------------
#  while:      2.020000   0.000000   2.020000 (  2.024218)
#  for loop:   2.280000   0.000000   2.280000 (  2.279738)
#  times:      2.230000   0.000000   2.230000 (  2.227971)
#  upto:       2.200000   0.000000   2.200000 (  2.206145)
#  until:      2.010000   0.000000   2.010000 (  2.006059)
#  each:       2.230000   0.000000   2.230000 (  2.233922)
# ------------------------------------ total: 12.970000sec