From: "Simon Kröger" <SimonKroeger@...>
Date: 2005-08-13T20:50:28+09:00
Subject: Re: no clue

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Hi Joe,

as a more serious contribution to your problem:
this is 10 times faster:

data.each{ |j, line|
   k, v = -2, 0
   while (v = line.index(58, k))
     h5[j][line[(k+2)...v].intern] =
       line[(v+2)...(k = line.index(44, v) || line.length)]
   end
}

i attached the whole test script, the output is:

                           user     system      total        real
inject                4.640000   0.046000   4.686000 (  4.687000)
scan                  5.204000   0.063000   5.267000 (  5.875000)
eval                  6.078000   0.016000   6.094000 (  6.094000)
tmp                   4.375000   0.000000   4.375000 (  4.391000)
index                 0.312000   0.000000   0.312000 (  0.312000)
true

cheers

Simon

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 filename="hack.rb"

require 'benchmark'

a = []
100.times {|i| a << [i, "x_position: #{200+i}, y_position: #{400+i}, z_position: #{300+i}"]}

data = a
iter = 1000
h1 = h2 = h3 = h4 = h5 = {}

Benchmark.bm 20 do |bm|
	bm.report("inject") do
		iter.times {
			data.each{|i, line| h1[i]={}; line.split(/\s*[:,]\s*/).inject(false){|a,b|
			  if a then h1[i][a.to_sym]=b; a=false else a=b end }}
		}
	end
	
	bm.report "scan" do
		iter.times {
		data.each{|i, line|h2[i]={}; line.scan(/(\w+)\s*:\s*([^, ]*)/) do |k, v|
		  h2[i][k.to_sym] = v
		end
		} }
	end
	
	bm.report "eval" do
		iter.times {
			h3 = eval('{' << ('~' << data.join('~')).
				gsub!(/\s*([^:~]+):\s*([^,~]+),?/, ':\1=>\'\2\',').
					gsub!(/~(\d+)~/, '},\1=>{')[2..-2] << '}}')
		}
	end
	
	bm.report "tmp" do
		iter.times {
			data.each{ |j, line| h4[j]={};tmp = line.split(/\s*[:,]\s*/)
				(0...tmp.size).step(2){ |i| h4[j][tmp[i].to_sym]=tmp[i+1] }
			}}
	end

	bm.report "index" do
		iter.times {
			data.each{ |j, line| 
				k, v = -2, 0
				while (v = line.index(58, k))
					h5[j][line[(k+2)...v].intern] = line[(v+2)...(k = line.index(44, v) || line.length)]
				end
			}
		}
	end

end

p((h1 == h2) && (h1 == h3) && (h1 == h4) && (h1 == h5))

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