From: Robert Klemme <shortcutter@...>
Date: 2006-08-01T20:45:05+09:00
Subject: Re: using the current method name within current method

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Logan Capaldo wrote:
> 
> On Jul 31, 2006, at 4:25 AM, Robert Klemme wrote:
> 
>> Matt Todd wrote:
>>> If you wanted to modularize it just for the sake of it, you could do
>>> something similar to the following:
>>> module CurrentMethodName
>>>  def this_method
>>>    caller[0]=~/`(.*?)'/
>>>    $1
>>>  end
>>> end
>>
>> You can rewrite that as
>>
>> def this_method
>>   caller[0][/`([^']*)'/, 1]
>> end
>>
>> and thusly avoid the global variable.
>>
>> Kind regards
>>
>>     robert
>>
> 
> I have a sneaking suspicion he might have done it with the global 
> variable (although $1 isn't really global) on purpose, since =~ 
> /literal/ is the fastest way to do a regexp.

I did a benchmark just to put some meat to this:

13:37:39 [Temp]: ./bm.rb
Rehearsal --------------------------------------------
global     1.859000   0.000000   1.859000 (  1.863000)
String[]   2.156000   0.000000   2.156000 (  2.180000)
----------------------------------- total: 4.015000sec

                user     system      total        real
global     1.828000   0.000000   1.828000 (  1.872000)
String[]   2.094000   0.000000   2.094000 (  2.172000)

IOW, the global var version uses 87,3% of the time or is 15% faster.

Kind regards

	robert


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#!/usr/bin/env ruby

require 'benchmark'

REPEAT = 1_00_000

def this_method_1
  caller[0][/`([^']*)'/, 1]
end

def this_method_2
  caller[0] =~ /`([^']*)'/ and $1
end

Benchmark.bmbm do |bm|
  bm.report "global" do
    REPEAT.times do
      this_method_2
    end
  end

  bm.report "String[]" do
    REPEAT.times do
      this_method_1
    end
  end
end

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