From: Aaron Smith <beingthexemplary@...>
Date: 2007-03-11T01:54:30+09:00
Subject: Re: OpenStruct,, know what keys are set

> 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

Ah yes, you caught me. I completely overlooked this code in the above 
exmaple:
class OpenStruct
  def keys_added
    @table.keys.map{|k| k.to_s}
  end
end


--
New Tests:

require 'ostruct'
require 'benchmark'

class OpenStruct
  def keys_added
    @table.keys.map{|k| k.to_s}
  end
end

lady = OpenStruct.new
0.upto(10) 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}
  x.report("Find all keys 
4"){lady.instance_variable_get("@table").keys.map{|k| k.to_s }}
end


#puts "\n" + lady.methods(false).grep(/[^=]$/).to_s
#puts "\n" + lady.instance_variable_get("@table").keys.to_s
#puts "\n" + lady.keys_added.to_s
#puts "\n" + lady.instance_variable_get("@table").keys.map{|k| k.to_s 
}.to_s


OUTPUT:
                 user     system      total        real
Find all keys 1  0.000000   0.000000   0.000000 (  0.000077)
Find all keys 2  0.000000   0.000000   0.000000 (  0.000014)
Find all keys 3  0.000000   0.000000   0.000000 (  0.000017)
Find all keys 4  0.000000   0.000000   0.000000 (  0.000016)

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