From: Robert Klemme <shortcutter@...>
Date: 2008-07-03T21:13:53+09:00
Subject: Re: thoughts on a more generic Array#partition function

2008/7/3 Rick DeNatale <rick.denatale@gmail.com>:
> On Thu, Jul 3, 2008 at 12:53 AM, Peņa, Botp <botp@delmonte-phil.com> wrote:
>
>> 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,
>>
>
> Not exactly the same, values doesn't guarantee the desired ordering by key.

That's easily fixed:

arbitrary_hash.sort_by {|k,| k}.map {|k,v| v}

Having said that the #group_by implementation seems the more general
solution (because of less requirements, i.e. keys do not need to
provide <=>).

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end