premature_optimization.rb

#!/usr/bin/env ruby

# "We should forget about small efficiencies, say about 97% of the time:
# premature optimization is the root of all evil" 
#   - Donald Knuth

require 'securerandom'

def rarray size
  size.times.inject(Array.new) do |result, _|
    result << SecureRandom.hex
  end
end

rps = 100
size = 1000
a = rarray size


t1 = Time.new
rps.times do
  a.sort
end
t2 = Time.new

r1 = t2 - t1

t1 = Time.new
rps.times do
  a.sort!
end
t2 = Time.new

r2 = t2 - t1

puts "time1: #{r1.inspect}"
puts "time2: #{r2.inspect}"
puts "diff : #{r1 - r2}"