From: Aaron Smith <beingthexemplary@...>
Date: 2007-03-13T04:59:44+09:00
Subject: Re: OpenStruct,, know what keys are set

Jan Friedrich wrote:
> o = OpenStruct.new
> o.foo = 2
> o.bar = 4
> o.marshal_dump # => {:foo=>2, :bar=>4}
> o.marshal_dump.keys # => [:foo, :bar]
> 
> regards,
> Jan

nice one, that's faster..

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"){
    0.upto(100000) do
      lady.methods(false).grep(/[^=]$/)
    end
  }

  x.report("Find all keys 2"){
    0.upto(100000) do
      lady.instance_variable_get("@table").keys
    end
  }

  x.report("Find all keys 3"){
    0.upto(100000) do
      lady.keys_added
    end
  }


  x.report("Find all keys 4"){
    0.upto(100000) do
      lady.instance_variable_get("@table").keys.map{|k| k.to_s }
    end
  }

  x.report("Find all keys 5"){
    0.upto(100000) do
      lady.marshal_dump.keys
    end
  }
end

user     system      total        real
Find all keys 1  4.110000   0.010000   4.120000 (  4.151098)
Find all keys 2  0.160000   0.000000   0.160000 (  0.153028)
Find all keys 3  0.870000   0.010000   0.880000 (  0.884275)
Find all keys 4  0.900000   0.000000   0.900000 (  0.897666)
Find all keys 5  0.130000   0.000000   0.130000 (  0.137231)

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