.first() vs :first vs eq(0)

JavaScript performance comparison

Revision 6 of this test case created

Info

which is faster .first(), :first or .eq(0)?

Stack Overflow Question: http://stackoverflow.com/questions/2312761/jquery-first-vs-first

Preparation code

<ul>
  <li> <span class="the-span">One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>One</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Two</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Three</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Four</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
  <li> <span>Five</span> <div><div><div><span>Info</span></div></div><div></div></div></li>
</ul>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

Preparation code output

  • One
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Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

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Testing in unknown unknown
Test Ops/sec
.first()
console.log(
  $('ul').find('.the-span').first().text()
);
pending…
all
console.log(
  $('ul').find('.the-span').text()
);
pending…
.eq(0)
console.log(
  $('ul').find('.the-span').eq(0).text()
);
pending…

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