From: Greg Donald <gdonald@...>
Date: 2009-09-26T00:44:31+09:00
Subject: Re: How to remove duplicate elements in a 2D array

On Fri, Sep 25, 2009 at 10:34 AM, Li Chen <chen_li3@yahoo.com> wrote:
> Hi all,
>
> I have a 2D array as follow:
>
> arr=[
>
>     [ 'a',1,2,3],
>     ['b',4,5,6],
>     ['c',3,2,1],
>     ['a',1.3,2.2,3,3],
>     ...
>     ['a', 2,1,3],
>   ...
>   ['a',2.1,1.5,3]
>
> ]
>
> As you can see there are several rows containing  element 'a',
> and the last row containing 'a'' is the lastest one.  I wonder if it
> is possible to return a new array which contains the latest row having
> 'a' ,
> together with other rows.


Something like this perhaps:

arr.collect{ |a| a.include?( 'a' ) ? a : nil }.compact



-- 
Greg Donald
http://destiney.com/