title: What does an exclamation mark in Lua do?
body: <p>Question is in the title, really. I saw someone use this earlier and I didn't know what the <code>!</code> was used for.</p>
  
  <pre><code>local lowestIndex = 0;
  local lowestValue = false;
  for k, v in ipairs(playerElement) do
      if !lowestValue or v.value &lt; lowestValue then
          lowestIndex = k;
          lowestValue = v;
      end
  end
  </code></pre>