From: Mike Fletcher <lemurific+rforum@...>
Date: 2006-10-13T03:42:32+09:00
Subject: Re: Isolating non-unique items in an array

Jason Burgett wrote:
> I'm basically trying to the opposite of .uniq Let's say I have an array:
> 
> ["a", "a", "a", "b", "c", "d", "d"]
> 
> I would like to boil this down by first tossing the values that only 
> appear once. Which leaves me with:
> 
> ["a", "a", "a", "d", "d"]
> 
> Then I need to somehow determine that "a" appears 3 times and "d" 
> appears 2 times. Any help would be great. Thanks.

a = %w( a a a b c d d )
want_and_counts = a.inject( Hash.new(0) ) { |h,x| h[x]+=1; h }.reject { 
|k,v| v == 1 }

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