Hi,

I did some simple speed test (See below), found that
1. a="something #{aString}" is faster than a="somthing "+aString
2. for ... in is faster than until...end?

I'm not sure about the result especially the 2nd one. How can we make the 
loop faster? I found that for ... in is displayed as #each in the 
profiler...

btw, the last question, I lost the post about Ruby++, because when I tried 
i++ it doesn't work, I need to use i+=1. I remembered there is a post by 
some senior Rubyist here, can anyone give me the # of that post in rubytalk? 
I can't find it in www.rubytalk.org.

Thanks!
Shannon

-- code below --

b="hello"
for i in 1..10000
  a="test #{b}"
end

  %   cumulative   self              self     total
time   seconds   seconds    calls  ms/call  ms/call  name
100.00     0.38      0.38        1   375.00   375.00  Range#each
  0.00     0.38      0.00        1     0.00   375.00  #toplevel

b="hello"
for i in 1..10000
  a="test "+b
end

  %   cumulative   self              self     total
time   seconds   seconds    calls  ms/call  ms/call  name
71.82     0.83      0.83        1   831.00  1157.00  Range#each
28.18     1.16      0.33    10000     0.03     0.03  String#+
  0.00     1.16      0.00        1     0.00  1157.00  #toplevel

b="hello"
i=1
until i>10000
  a="test #{b}"
  i+=1
end

  %   cumulative   self              self     total
time   seconds   seconds    calls  ms/call  ms/call  name
20.36     0.44      0.44    10001     0.04     0.04  Fixnum#>
11.64     0.69      0.25    10000     0.03     0.03  Fixnum#+
  0.00     0.69      0.00        1     0.00  2156.00  #toplevel



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