From: Christopher Dicely <cmdicely@...>
Date: 2009-02-13T17:13:49+09:00
Subject: Re: Arrays and Hashes processing :pls help

On 2/12/09, Jags Rao <aquajags@yahoo.com> wrote:
>
>
> hi friends
>
> i have a long array with structure like this
>
> [["377", "838"],
>  ["377", "990"],
>  ["377", "991"],
>  ["377", "992"],
>  ["378", "840"],
>  ["378", "841"],
>  ["378", "842"],
>  ["378", "843"],
>  ["378", "844"]]
>
> how can i convert it in one line to
>
> [["377", "838 990 991 992"],
>  ["378", "840 841 842 843 844"]]

original_array = [["377", "838"],
 ["377", "990"],
 ["377", "991"],
 ["377", "992"],
 ["378", "840"],
 ["378", "841"],
 ["378", "842"],
 ["378", "843"],
 ["378", "844"]]

new_array = original_array.group_by {|x| x[0]}.map {|k,v| [k, v.join(" ")]}