[Boulder Ruby Group] Anyone else see this?

[ara.t.howard]

On Jun 29, 2007, at 11:54 PM, Tony Arcieri wrote:

> http://m.onkey.org/2007/6/30/let-s-start-with-wtf
>
> Just did my own little test...
>
> ~$ irb -rbenchmark -rubygems -ractive_support
> >> class Fixnum; def timestwo; self * 2; end; end
> => nil
> >> puts Benchmark.measure { (1..10000000).map { |n| n.timestwo } }
>  13.570000   0.100000  13.670000 ( 13.795564)
> => nil
> >> puts Benchmark.measure { (1..10000000).map(&:timestwo) }
>  48.370000   0.080000  48.450000 ( 48.517666)
> => nil
>
> Yikes
>
> --  
> Tony Arcieri
> ClickCaster, Inc.
> tony at clickcaster.com
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> Bdrg-members at rubyforge.org
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less capable.

cfp:~ > cat a.rb
require 'benchmark'

class Symbol
   def to_proc
     lambda{|obj| obj.send self}
   end
end

n = 10000

s = Struct.new :id
messages = []
n.times { messages << s.new(:id => rand(n)) }

Benchmark.bm do |x|
   # Integer
   x.report { n.times { messages.map{|m| m.id} } }
   x.report { n.times { messages.map(&:id) } }
end

cfp:~ > ruby a.rb
       user     system      total        real
31.160000   1.200000  32.360000 ( 33.135435)
40.640000   1.380000  42.020000 ( 43.270193)



-a
--
we can deny everything, except that we have the possibility of being  
better. simply reflect on that.
h.h. the 14th dalai lama



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