From: "Peña, Botp" <botp@...>
Date: 2008-07-03T13:53:55+09:00
Subject: Re: thoughts on a more generic Array#partition function

From: Rudi Cilibrasi [mailto:cilibrar@gmail.com] 
# h = a.group_by() { |i| func(i) }
# h.keys.sort.map { |k| h[k] }
# This is not so bad, but perhaps has a small disadvantage that it
# requires eql? and hash methods defined unlike npartition.   But I
# cannot figure out a simpler version to get array of array's output.

just apply #values to it, 

> h=a.group_by { |i| i % 3 }
=> {0=>[3, 9, 12], 1=>[1, 4, 7, 13], 2=>[2, 11, 14]}
> h.values
=> [[3, 9, 12], [1, 4, 7, 13], [2, 11, 14]]

kind regards -botp