From: Li Chen <chen_li3@...>
Date: 2009-09-26T05:50:36+09:00
Subject: Re: How to  remove duplicate elements in a 2D array

Yes this is what I want. But can you explain the code line  in a little 
bit more?

Thanks,

Li


Thairuby ->a, b {a + b} wrote:
> 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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