title: jQuery equivalent of querySelector
body: <p>What is the jQuery equivalent of querySelector? The only way I've found so far is to select all then pick the first selection:</p>
  
  <pre><code>$(selectorString)[0]
  </code></pre>
  
  <p>With the above expression, is jQuery smart enough to stop after finding the first match?</p>
  
  <p>Update: @Mutnowski suggested using eq() and first, but after reading the jQuery documentation those two methods seem to have the same drawback: jQuery will first get all matches, then only filter out the first element.</p>