From: Jeremy Wells <jwells@...>
Date: 2007-08-24T22:08:26+09:00
Subject: Re: Combining Array Elements

gregarican wrote:
> I have an array that I would like to combine elements. Here's a sample
> array:
>
> [["Value A", "Value B", 3], ["Value A", "Value C", 2],["Value A",
> Value B", 1]]
>
> What I would like to do is find the elements where the first two items
> are the same and then combine the third. The resulting array would
> consist of:
>
> [["Value A", "Value B", 4],["Value A", "Value C", 2]]
>
> This is something that is out in left field in terms of how I've used
> arrays in the past. Anyone know of a quick bit of script I can whip up
> that will suit the task?
>   
new_array = array.collect{|v| [v[0],v[1], a.select{|b| b[0] == v[0] && 
b[1] == v[1] }.inject(0){|m,b| m + b.last}]}.uniq