Comparaison blank? present? Nil ?

gistfile1.rb

require 'rubygems'

# Set up gems listed in the Gemfile.
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('Gemfile', __FILE__)
require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
require 'rails/all'

N = 10000000
EMPTY_STRING = ''

Benchmark.bmbm do |x|
  x.report('empty') { N.times {
    EMPTY_STRING.empty?
  } }
  x.report('== empty') { N.times {
    EMPTY_STRING == ''
  } }
  x.report('== nil') { N.times {
    EMPTY_STRING == nil
  } }
  x.report('nil') { N.times {
    EMPTY_STRING.nil?
  } }
  x.report('== nil and empty') { N.times {
    EMPTY_STRING == nil && EMPTY_STRING != ''
  } }
  x.report('== presence and empty') { N.times {
    EMPTY_STRING && EMPTY_STRING != ''
  } }
  # BEST
  x.report('nil and empty') { N.times {
    EMPTY_STRING.nil? && !EMPTY_STRING.empty?
  } }
  x.report('presence and empty') { N.times {
    EMPTY_STRING && !EMPTY_STRING.empty?
  } }
  x.report('blank') { N.times {
    EMPTY_STRING.blank?
  } }
end


# https://gist.github.com/31df105283e577987c00
#                             user     system      total        real
# empty                   1.190000   0.000000   1.190000 (  1.208954)
# == empty                2.950000   0.010000   2.960000 (  3.343867)
# == nil                  1.940000   0.010000   1.950000 (  1.996039)
# nil                     1.170000   0.000000   1.170000 (  1.222273)
# == nil and empty        1.940000   0.010000   1.950000 (  2.068318)
# == presence and empty   2.940000   0.010000   2.950000 (  3.014012)
# nil and empty           1.220000   0.000000   1.220000 (  1.480397)
# presence and empty      1.360000   0.000000   1.360000 (  1.383167)
# blank                   9.290000   0.030000   9.320000 (  9.797732)