Reversing a integer value list
<p>I have a list of integer values which can be anywhere between 1 and 4.
So, let's say <code>{1,2,4,1,3,2,1,4,4}</code> for instance.
I now want to reverse the values in the following way:
All entries with ...</p>

<ul>
<li>1 should be converted to 4,</li>
<li>2 should be converted to 3,</li>
<li>3 should be converted to 2,</li>
<li>4 should be converted to 1.</li>
</ul>

<p>There are numerous ways to do this but I want to take the most efficient approach.</p>

<p>Any thoughts?</p>
