From: dblack@...
Date: 2006-11-07T22:27:37+09:00
Subject: Re: dividing an array

Hi --

On Tue, 7 Nov 2006, Jan Svitok wrote:

> On 11/7/06, Brad Tilley <rtilley@vt.edu> wrote:
>> Say I have an array that contains 144 strings. I want to divide the array 
>> into
>> 12 sub-arrays each containing 12 strings. What is the Ruby Way of doing 
>> this?
>> I've looked at slice array[0..11] etc, but that seems a bit clunky.
>> 
>> Thank you,
>> Brad
>> 
>
> require 'enumerator'
>
> ret = []
> array.each_slice(12) {|a| ret << a}

I wish there were a nice way to do this without the temporary array.
One of the first add-on methods I ever wrote for my own use in Ruby
was "in_chunks_of":

   [1,2,3,4,5,6].in_chunks_of(2) => [ [1,2], [3,4], [5,6] ]

The ActiveSupport library has something similar (in_groups_of).  I
think it would be a handy addition to Array.


David

-- 
                   David A. Black | dblack@wobblini.net
Author of "Ruby for Rails"   [1] | Ruby/Rails training & consultancy [3]
DABlog (DAB's Weblog)        [2] | Co-director, Ruby Central, Inc.   [4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org