From: martindemello@... (Martin DeMello)
Date: 2002-10-21T07:51:58+09:00
Subject: Grouping by twos

Another of those trivial little problems that I obsess about finding
the Proper way to do - what's a nice, idiomatic Ruby way to go from
[a,b,c,d.....] to [[a,b],[c,d],[e,f],...]? Note that I want to
preserve the ordering, so to_hash won't work.

One way I thought of was
b = []
while a[0] do
  b << [a.shift, a.shift]
end

which works but doesn't look particularly elegant.

martin