ruby-way-fail.rb

# Ruby way fail

# Implementation of a simple method to convert seconds to time format (03:44:23)

require "benchmark"

seconds = 45020

hours   = seconds / 3600
minutes = seconds / 60 % 60
seconds = seconds % 60

n = 1000000

Benchmark.bm do |b|
  # Ruby way
  b.report do
    n.times { [hours, minutes, seconds].map{ |time| time.to_s.rjust(2, "0") }.join(":") }
  end

  # Kitten killer way (aka using sprintf)
  b.report do
    n.times { "%02d:%02d:%02d" % [hours, minutes, seconds] }
  end
end

#      user     system      total        real
#  4.650000   0.000000   4.650000 (  4.701532)
#  2.740000   0.000000   2.740000 (  2.767670)