rescue-vs-respond-to.rb

rescue-vs-respond-to.rb

require 'benchmark/ips'

module RescueVsRespondTo
  module HelperClasses
    class Receiver
      def dummy; true end
      def does_exist; true end
    end

    class Great20Grandparent < Receiver; end
    class Great19Grandparent < Great20Grandparent; end
    class Great18Grandparent < Great19Grandparent; end
    class Great17Grandparent < Great18Grandparent; end
    class Great16Grandparent < Great17Grandparent; end
    class Great15Grandparent < Great16Grandparent; end
    class Great14Grandparent < Great15Grandparent; end
    class Great13Grandparent < Great14Grandparent; end
    class Great12Grandparent < Great13Grandparent; end
    class Great11Grandparent < Great12Grandparent; end
    class Great10Grandparent < Great11Grandparent; end
    class Great9Grandparent < Great10Grandparent; end
    class Great8Grandparent < Great9Grandparent; end
    class Great7Grandparent < Great8Grandparent; end
    class Great6Grandparent < Great7Grandparent; end
    class Great5Grandparent < Great6Grandparent; end
    class Great4Grandparent < Great5Grandparent; end
    class Great3Grandparent < Great4Grandparent; end
    class Great2Grandparent < Great3Grandparent; end
    class GreatGrandparent < Great2Grandparent; end
    class Grandparent < GreatGrandparent; end
    class Parent < Grandparent; end
    class DeepReceiver < Parent; end
  end

  class LocalVariableOrMethod
    def dummy; true end
    def does_exist; true end

    def test_rescue_does_exist
      does_exist
    rescue
      dummy
    end

    def test_rescue_doesnt_exist
      doesnt_exist
    rescue
      dummy
    end

    def test_respond_to_does_exist
      if respond_to?(:does_exist)
        does_exist
      else
        dummy
      end
    end

    def test_respond_to_doesnt_exist
      if respond_to?(:doesnt_exist)
        doesnt_exist
      else
        dummy
      end
    end
  end

  class ExplicitReceiver
    def initialize
      @receiver = HelperClasses::Receiver.new
    end

    def test_rescue_does_exist
      @receiver.does_exist
    rescue
      @receiver.dummy
    end

    def test_rescue_doesnt_exist
      @receiver.doesnt_exist
    rescue
      @receiver.dummy
    end

    def test_respond_to_does_exist
      if @receiver.respond_to?(:does_exist)
        @receiver.does_exist
      else
        @receiver.dummy
      end
    end

    def test_respond_to_doesnt_exist
      if @receiver.respond_to?(:doesnt_exist)
        @receiver.doesnt_exist
      else
        @receiver.dummy
      end
    end
  end

  class LongInheritanceChain < ExplicitReceiver
    def initialize
      @receiver = HelperClasses::DeepReceiver.new
    end
  end
end

def global_dummy; true end
def global_does_exist; true end

def test_rescue_global_does_exist
  global_does_exist
rescue
  global_dummy
end

def test_rescue_global_doesnt_exist
  global_doesnt_exist
rescue
  global_dummy
end

def test_respond_to_global_does_exist
  if respond_to?(:does_exist)
    global_does_exist
  else
    global_dummy
  end
end

def test_respond_to_global_doesnt_exist
  if respond_to?(:doesnt_exist)
    global_doesnt_exist
  else
    global_dummy
  end
end

Benchmark.ips do |x|
  %w[ LocalVariableOrMethod ExplicitReceiver LongInheritanceChain ].each do |class_name|
    subject = RescueVsRespondTo.const_get(class_name).new

    x.report("#{class_name}#test_rescue_does_exist")       { subject.test_rescue_does_exist }
    x.report("#{class_name}#test_rescue_doesnt_exist")     { subject.test_rescue_doesnt_exist }
    x.report("#{class_name}#test_respond_to_does_exist")   { subject.test_respond_to_does_exist }
    x.report("#{class_name}#test_respond_to_doesnt_exist") { subject.test_respond_to_doesnt_exist }
  end

  x.report("test_rescue_global_does_exist")       { test_rescue_global_does_exist }
  x.report("test_rescue_global_doesnt_exist")     { test_rescue_global_doesnt_exist }
  x.report("test_respond_to_global_does_exist")   { test_respond_to_global_does_exist }
  x.report("test_respond_to_global_doesnt_exist") { test_respond_to_global_doesnt_exist }
  x.compare!
end

rescue-vs-respond-to_result.txt

$ ruby -v rescue-vs-respond-to.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin15]
Calculating -------------------------------------
LocalVariableOrMethod#test_rescue_does_exist
                       153.478k i/100ms
LocalVariableOrMethod#test_rescue_doesnt_exist
                        36.693k i/100ms
LocalVariableOrMethod#test_respond_to_does_exist
                       139.936k i/100ms
LocalVariableOrMethod#test_respond_to_doesnt_exist
                       136.213k i/100ms
ExplicitReceiver#test_rescue_does_exist
                       147.227k i/100ms
ExplicitReceiver#test_rescue_doesnt_exist
                        32.197k i/100ms
ExplicitReceiver#test_respond_to_does_exist
                       137.546k i/100ms
ExplicitReceiver#test_respond_to_doesnt_exist
                       131.152k i/100ms
LongInheritanceChain#test_rescue_does_exist
                       147.703k i/100ms
LongInheritanceChain#test_rescue_doesnt_exist
                        32.647k i/100ms
LongInheritanceChain#test_respond_to_does_exist
                       140.061k i/100ms
LongInheritanceChain#test_respond_to_doesnt_exist
                       132.879k i/100ms
test_rescue_global_does_exist
                       149.804k i/100ms
test_rescue_global_doesnt_exist
                        35.270k i/100ms
test_respond_to_global_does_exist
                       133.853k i/100ms
test_respond_to_global_doesnt_exist
                       131.175k i/100ms
-------------------------------------------------
LocalVariableOrMethod#test_rescue_does_exist
                          6.889M (± 6.9%) i/s -     34.379M
LocalVariableOrMethod#test_rescue_doesnt_exist
                        433.941k (± 7.9%) i/s -      2.165M
LocalVariableOrMethod#test_respond_to_does_exist
                          5.072M (± 6.8%) i/s -     25.328M
LocalVariableOrMethod#test_respond_to_doesnt_exist
                          4.362M (± 7.2%) i/s -     21.794M
ExplicitReceiver#test_rescue_does_exist
                          6.652M (± 9.8%) i/s -     32.684M
ExplicitReceiver#test_rescue_doesnt_exist
                        390.686k (± 5.7%) i/s -      1.964M
ExplicitReceiver#test_respond_to_does_exist
                          4.710M (±10.1%) i/s -     23.245M
ExplicitReceiver#test_respond_to_doesnt_exist
                          4.198M (±10.2%) i/s -     20.591M
LongInheritanceChain#test_rescue_does_exist
                          7.021M (± 5.7%) i/s -     35.006M
LongInheritanceChain#test_rescue_doesnt_exist
                        401.436k (± 4.1%) i/s -      2.024M
LongInheritanceChain#test_respond_to_does_exist
                          4.875M (± 5.5%) i/s -     24.371M
LongInheritanceChain#test_respond_to_doesnt_exist
                          4.242M (± 6.8%) i/s -     21.128M
test_rescue_global_does_exist
                          7.199M (± 5.8%) i/s -     35.953M
test_rescue_global_doesnt_exist
                        440.868k (± 7.2%) i/s -      2.222M
test_respond_to_global_does_exist
                          4.477M (± 8.7%) i/s -     22.086M
test_respond_to_global_doesnt_exist
                          4.494M (± 5.6%) i/s -     22.431M

Comparison:
test_rescue_global_does_exist:  7198903.1 i/s
LongInheritanceChain#test_rescue_does_exist:  7020856.7 i/s - 1.03x slower
LocalVariableOrMethod#test_rescue_does_exist:  6889267.6 i/s - 1.04x slower
ExplicitReceiver#test_rescue_does_exist:  6652320.0 i/s - 1.08x slower
LocalVariableOrMethod#test_respond_to_does_exist:  5071518.2 i/s - 1.42x slower
LongInheritanceChain#test_respond_to_does_exist:  4875481.1 i/s - 1.48x slower
ExplicitReceiver#test_respond_to_does_exist:  4710240.7 i/s - 1.53x slower
test_respond_to_global_doesnt_exist:  4493565.9 i/s - 1.60x slower
test_respond_to_global_does_exist:  4476828.4 i/s - 1.61x slower
LocalVariableOrMethod#test_respond_to_doesnt_exist:  4361534.9 i/s - 1.65x slower
LongInheritanceChain#test_respond_to_doesnt_exist:  4242077.8 i/s - 1.70x slower
ExplicitReceiver#test_respond_to_doesnt_exist:  4197999.7 i/s - 1.71x slower
test_rescue_global_doesnt_exist:   440868.3 i/s - 16.33x slower
LocalVariableOrMethod#test_rescue_doesnt_exist:   433941.1 i/s - 16.59x slower
LongInheritanceChain#test_rescue_doesnt_exist:   401436.4 i/s - 17.93x slower
ExplicitReceiver#test_rescue_doesnt_exist:   390686.3 i/s - 18.43x slower