From: Moises Machado <moisesmachado@...>
Date: 2007-05-12T22:47:26+09:00
Subject: Re: how to remove dups from 2 lists?

Mike Steiner wrote:
> while results

Well, this while loop will not terminate because [] is considered true 
in ruby, use this instead

while results != []

or the more idiomatic

while not results.empty?

>         a = a - m
>         b = b - m

I don't think that this '-' works here, you probably meant:

a.delete_at(a.index(m))
b.delete_at(b.index(m))

because a = a - [m] will remove all m's of a and make the code do the 
same as:

a, b = a - (a&b), b - (a&b)

although i like the elegance of that solution i prefer something like 
this:

def removeDupsFromLists ( list1 , list2 )
  x = list1.dup
  x.each do | i |
    if list2.include?(i)
      list1.delete_at( list1.index(i) )
      list2.delete_at( list2.index(i) )
    end
  end
  return [ list1, list2 ]
end

just because is easier to follow and to debug: there is no way of get an 
infinte loop


MoisesMachado


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