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    <p>The exception is occurring because you are trying to compare nil. You get a different exception when nil is on the left.</p> <pre><code>'1' &lt; nil #=&gt; scratch.rb:1:in `&lt;': comparison of String with nil failed (ArgumentError) nil &gt; '1' scratch.rb:1:in `&lt;main&gt;': undefined method `&gt;' for nil:NilClass (NoMethodError) </code></pre> <p>Your code gets into this situation when the <code>left</code> or <code>right</code> array is empty (ie all of its elements have been added to A already). Presumably, this is why you had originally added the if-statements for <code>nanol == 0</code> and <code>nanor == 0</code> (ie to handle when one of the arrays is empty).</p> <p>Your if-statements have a couple of issues:</p> <ol> <li>You do need the <code>nanol == 0</code> and <code>nanor == 0</code> statements</li> <li>The three if-statements are always run, even though only one would apply in an iteration</li> <li><code>nanol</code> and <code>nanor</code> are never re-calculated (ie they will never get to zero)</li> <li>When the left and right values are equal, you don't actually add anything to the <code>A</code> array</li> </ol> <p>The inside of your iteration should be:</p> <pre><code>smallest_left = left.min smallest_right = right.min nanol=left.length nanor=right.length if nanol == 0 #Handles left no longer having values A &lt;&lt; right.delete_at(right.index(smallest_right) || right.length) elsif nanor == 0 #Handles right no longer having values A &lt;&lt; left.delete_at(left.index(smallest_left) || left.length) elsif smallest_left &lt; smallest_right A &lt;&lt; left.delete_at(left.index(smallest_left) || left.length) elsif smallest_left &gt; smallest_right A &lt;&lt; right.delete_at(right.index(smallest_right) || right.length) else #They are equal so take one A &lt;&lt; left.delete_at(left.index(smallest_left) || left.length) end </code></pre> <p>You will still have an issue (no error, but unexpected results) when your list has an odd number of elements. But hopefully that answers your question.</p>
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    1. COthis was great! Thank you :) after all i get `'pop': can't convert Array into Integer (TypeError)`
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    2. COI cannot reproduce that error. But looking at the code again, Array#pop was not the right way to remove the element from the array (as it removes the last element not the min element). I updated the code to use Array#delete_at (as discussed in this [other question](http://stackoverflow.com/questions/4595305/delete-first-instance-of-matching-element-from-array)).
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