From: "Jan E." <lists@...>
Date: 2012-09-07T03:11:06+09:00
Subject: Re: Subtraction, union and intersection of arrays in Ruby

Hi,

So you're not even allowed to use basic methods like Array#include? In 
this case you'll need a nested iterator to check for every element if 
it's in the subtracted array. However, I refuse to use a "for" loop, 
because it's merely the evil twin of the "each" method and is in no way 
more "basic". Ruby isn't C.

So the code would look something like this:

result = []
op_sys.each do |op|
  add_element = true
  linux_sys.each do |linux|
    if op == linux
      add_element = false
      break
    end
  end
  result << op if add_element
end

Your own solution I don't understand. It seems you have some 
difficulties with the programming logic and Ruby syntax.

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