From: Joel VanderWerf <vjoel@...>
Date: 2006-10-21T08:31:16+09:00
Subject: Re: multi dim array?

Gavin Kistner wrote:
> From: Robert Klemme [mailto:shortcutter@googlemail.com] 
>> irb(main):002:0> r={"a"=>"B","e"=>"X"}
>> => {"a"=>"B", "e"=>"X"}
>> irb(main):003:0> "message".gsub(/./){|k| r[k]||k }
>> => "mXssBgX"
> 
> Ooh, that's elegant, using gsub's block like that.
> I think I'm going to steal it.
> 
> (I don't have any need for it, but...you know...I gotta HAVE it.)
> 

It might run faster if you do this:

reg = Regexp.new(r.keys.map {|k| Regexp.quote(k)}.join("|"))
p "message".gsub(reg){|k| r[k] }

(The #quote is needed in case of r["|"] = "x", for example.)

Saves you a hash lookup for each char. I guess it's faster, but I might 
be wrong. Benchmarking left as an exercise for the reader, i.e. I'm lazy :).

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407