From: Marnen Laibow-Koser <marnen@...>
Date: 2009-11-26T01:24:46+09:00
Subject: Re: Ruby internals & other questions

Ralph Shnelvar wrote:
> Is there a document or website that describes how Ruby works?

Well, every interpreter could be implemented a bit differently.  There 
*is* a spec, although I don't know a URL offhand.

> 
> For instance ...
> 
> 
> 
> y=0
> 1_000_000.times {|x| y+=x}
> 
> 
> 
> (1) Does the block get compiled a million times?

Certainly not!  The block is an object, and is passed as an argument to 
the times function.

> 
> (2) What's the best Ruby way to do a sum from 1 to 1_000_000

Gauss's method:
def triangular(n)
  (n + 1) * n / 2
end

> 
> (3) Is there a difference in speed between IRB.exe and ruby.exe in
> executing the above code?

.exe?  What are you, one of those weird Windows users? :)

I don't see why there would be a difference -- it's the same 
interpreter.  But why not test it?

> 
> (4) In IRB, whats the best way to time the code, above?

I think there's a benchmark library or something like that.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen@marnen.org
-- 
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