if_unless_bmbm.rb

require 'benchmark'
require "active_support/core_ext/object/blank"

TIMES = 1000000

Benchmark.bmbm do |x|

  x.report("if present? (actually present)") do
    TIMES.times do
      if "1".present?
      end
    end
  end

  x.report("if present? (actually blank)") do
    TIMES.times do
      if "".present?
      end
    end
  end

  x.report("unless blank? (actually present)") do
    TIMES.times do
      unless "1".blank?
      end
    end
  end

  x.report("unless blank? (actually blank)") do
    TIMES.times do
      unless "".blank?
      end
    end
  end

end

result

# Rehearsal 不算入
                                       user     system      total        real
unless blank? (actually present)     0.700000   0.000000   0.700000 (  0.703966)
unless blank? (actually blank)       1.390000   0.000000   1.390000 (  1.399121)
if present? (actually present)       0.790000   0.000000   0.790000 (  0.795483)
if present? (actually blank)         1.410000   0.000000   1.410000 (  1.406053)
 
                                       user     system      total        real
unless blank? (actually present)     0.740000   0.000000   0.740000 (  0.741436)
unless blank? (actually blank)       1.400000   0.000000   1.400000 (  1.407183)
if present? (actually present)       0.780000   0.000000   0.780000 (  0.775220)
if present? (actually blank)         1.420000   0.010000   1.430000 (  1.431337)
 
# if/unless 上下對調
                                       user     system      total        real
if present? (actually present)       0.750000   0.000000   0.750000 (  0.745319)
if present? (actually blank)         1.430000   0.000000   1.430000 (  1.436408)
unless blank? (actually present)     0.660000   0.000000   0.660000 (  0.659880)
unless blank? (actually blank)       1.290000   0.000000   1.290000 (  1.295552)
 
                                       user     system      total        real
if present? (actually present)       0.730000   0.010000   0.740000 (  0.739630)
if present? (actually blank)         1.440000   0.000000   1.440000 (  1.433405)
unless blank? (actually present)     0.650000   0.000000   0.650000 (  0.654705)
unless blank? (actually blank)       1.370000   0.000000   1.370000 (  1.368957)