From: Dave Thomas <Dave@...>
Date: 2002-10-21T08:41:36+09:00
Subject: Re: Grouping by twos

martindemello@yahoo.com (Martin DeMello) writes:

> 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

This isn't much better, but

     b = []
     b << a.slice!(0,2) until a.empty?



Cheers


Dave