From: Mike Steiner <mikejaysteiner@...>
Date: 2007-05-11T11:18:15+09:00
Subject: how to remove dups from 2 lists?

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I'm trying to write some code that removes all elements from 2 lists that
are in both lists. However, I don't want any duplicates from each list
deleted also (which is what the array "-" operator does). The code I have
now doesn't handle restarting the current iteration for both loops when a
match is found and deleted in both loops. Here's the code:

def RemoveDupsFromLists ( list1 , list2 )
    list1.each_index do | i |
        list2.each_index do | j |
            if list1[i] == list2[j]
                list1.delete_at ( i )
                list2.delete_at ( j )
            end
        end
    end
    return [ list1 , list2 ]
end

What's weird is that doing this is easy in C (my first language), but
difficult in Ruby. Everything else I've seen has been MUCH easier in Ruby.

Mike Steiner

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