From: Robert Klemme <shortcutter@...>
Date: 2007-03-11T01:35:05+09:00
Subject: Re: OpenStruct,, know what keys are set

On 10.03.2007 16:53, Aaron Smith wrote:
> Thanks for all the input.
> 
> Heres some testing:
> 
> require 'ostruct'
> require 'benchmark'
> 
> lady = OpenStruct.new
> 0.upto(100) do |i|
>   eval("lady.cat#{i} = i")
>   #puts eval("lady.cat#{i}")
> end
> 
> Benchmark.bm do |x|
>   x.report("Find all keys 1"){lady.methods(false).grep(/[^=]$/)}
>   x.report("Find all keys 2"){lady.instance_variable_get("@table").keys}
>   x.report("Find all keys 3"){lady.keys_added}
> end
> 
> #puts "\n" + lady.methods(false).grep(/[^=]$/).to_s
> #puts "\n" + lady.instance_variable_get("@table").keys.to_s
> #puts "\n" + lady.keys_added #this is always nil.
> 
> 
> OUTPUT:
>                  user     system      total        real
> Find all keys 1  1.130000   0.050000   1.180000 (  1.185657)
> Find all keys 2  0.020000   0.000000   0.020000 (  0.019773)
> Find all keys 3  0.000000   0.000000   0.000000 (  0.000020)
> 
> Results speak for themselves.

Um, for what implementation of "keys_added"?  The comment points out 
that it always returns nil - I suspect you just measured performance of 
an OpenStruct ad hoc getter:

irb(main):005:0> OpenStruct.new.keys_added
=> nil
irb(main):006:0> OpenStruct.new.foo_bar
=> nil

Kind regards

	robert