From: George Ogata <g_ogata@...>
Date: 2002-08-15T11:14:07+09:00
Subject: RE: Is this array operation correct?

> Then, do something like:
> 
>  Array.new(3).map { [] }
> 
> Is there something shorter/more efficient?

If you don't like using Array.new, you can #map to a Range:

(1..3).map{[]}

(Dunno about efficiency, here.)

If you're going to map to a fresh Array, though, you may as well use the 
in-place version:

Array.new(3).map!{[]}