From: "Thairuby ->a, b {a + b}" <kabkab@...>
Date: 2009-09-26T02:57:24+09:00
Subject: Re: How to  remove duplicate elements in a 2D array

I think you want an array with unique member. If the member is not 
unique
then return the last occur of it.

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]]

result = arr.inject({}){|x,y| x[y[0]]=y[1..-1]; x}.map(&:flatten)
p result

# [["a", 2.1, 1.5, 3], ["b", 4, 5, 6], ["c", 3, 2, 1]]
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