Benchmark made easy

bench.rb

# Benchmark made easy
#
# bench { stuff }      # runs stuff 1000 times and returns the real time spent doing it
# bench(100) { stuff } # as above, but 100 times.
# 
# - vjt@openssl.it - public domain

module Kernel
  def bench(n = 1000, &block)
    raise ArgumentError, 'What should I benchmark?' unless block

    require 'benchmark'
    print "#{n} iterations: "
    time = Benchmark.measure { n.times(&block) }.real
    puts "%.06f (%.06f per iteration)" % [time, time / n]
  rescue LoadError
    puts "Benchmark is not available in this session"
  end
end