From: tamouse mailing lists <tamouse.lists@...>
Date: 2013-02-25T00:09:35+09:00
Subject: Re: How should I print only the last combination when using Array#combination(n) ?

On Sun, Feb 24, 2013 at 8:55 AM, Love U Ruby <lists@ruby-forum.com> wrote:
>>> a = [1,2,3]
> => [1, 2, 3]
>
>>> a.combination(2)
> => #<Enumerator: [1, 2, 3]:combination(2)>
>
>>> a.combination(2).to_a
> => [[1, 2], [1, 3], [2, 3]]
>
>>> a.combination(2){|arr| print arr.length;print "~~>";print arr;print"=>";p arr}
> 2~~>[1, 2]=>[1, 2]
> 2~~>[1, 3]=>[1, 3]
> 2~~>[2, 3]=>[2, 3]
> => [1, 2, 3]
>
> Any chance to get only the last combination,i.e [[2,3]] or 2~~>[2,
> 3]=>[2, 3] ?
>
> --
> Posted via http://www.ruby-forum.com/.
>

1.9.3-head :001 > [1,2,3].combination(2).to_a.last
 => [2, 3]