From: daz <dooby@...10.karoo.co.uk>
Date: 2005-10-14T07:31:59+09:00
Subject: Re: array1 + array2 newb question


Robert Klemme wrote:
> daz wrote:
> > Robert Klemme wrote:
>
> dz = []; a2.each{|s| dz.concat a1.map {|y| [y, s]}}
>

That's enlightening about #concat.  When you mentioned
it in reply to Simon, I read it as a reference to your
use of  <<.  #concat is one of those methods that wasn't
in my vocabulary -- I thought it was an alias for  +  or
something ... not so.

Most of the time I use  <<  unless it causes unrequired
nesting of arrays, then I go for  +.  What I hoped I was
doing with  +  is what #concat does, i.e. splices to the
receiving array without creating a new one.

As Douglas Adams almost wrote:
  "Well, that just about wraps it up for Array#+"  ;-)


Cheers,

daz

+ ....... Concatenation (produces a third array)
concat .. Appends elements (think of as  +!  bang-method)
push .... <<
<< ...... Append object  (alias of push)