From: Daniel Carrera <dcarrera@...>
Date: 2003-07-10T15:26:14+09:00
Subject: Re: Ruby T-Shirt Idea

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On Thu, Jul 10, 2003 at 03:18:01PM +0900, Mauricio Fern�ndez wrote:

> > Did you see mine?  It was one line! (with a semicolon though :)
> 
> They're the same if you omit the fact that I forgot about Enumerable#grep ;) 
> It turns out that $<, $DEFAULT_INPUT _and_ ARGF are synonyms. 

I didn't know that.  I should have guessed.

> IMHO one semicolon is equivalent to one line-break but we can still make
> it a one-liner without cheating:
> 
>  re = ARGV.shift and puts ARGF.grep(/#{re}/)
> 
> However, I don't quite like this example, it feels perlish.
> I'd rather show singleton methods at work, or blocks, or metaclasses...

Okay, so we agree on:

   re = ARGV.shift;
   ARGF.each{|x| puts x if x =~ /#{re}/}

It's Rubyish, and it avoids the perlishms like "$<" (akward variable names) and the "and".
A slight modification would be:

   re = ARGV.shift;
   puts ARGF.map{|x| x if x =~ /#{re}/}.compact


I'm not sure which one I like better.

- -- 
Daniel Carrera         | OpenPGP fingerprint:
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