getElementById vs. getElementsByClassName vs. querySelector vs. jQuery vs xpath

JavaScript performance comparison

Revision 91 of this test case created

Info

Changes to rev 26 (rev 27 is worse):
- repositioning xpath
- remove foo + checks for it (search for selecting elem by id once is enough)
- remove getElementById("poo") in querySelector (Class) & jQuery Class Selector for a true comparison of the algorithms.
- jQuery Class Selector -> jQuery w. querySelector
- added real jQuery ClassSelector

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<p id="bar" class="my-bar">
  Bar
</p>
<div id="poo" class="my-poo">
  <div id="par" class="my-bar">
    <div id="paz" class="my-bar">
      <span id="baz" class="my-baz">
        Baz
      </span>
    </div>
  </div>
</div>

Preparation code output

Bar

Baz

Test runner

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Testing in unknown unknown
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector (ID)
var bar = document.querySelector("#bar");
pending…
jQuery ID Selector
var bar = $("#bar");
pending…
xpath eval
var bar = document.evaluate("//*[@id='bar']",document,null,9,null).singleNodeValue;
pending…
getElementsByClassName
var baz = document.getElementsByClassName("my-baz");
 
pending…
querySelector (Class)
var baz = document.querySelector(".my-baz");
 
pending…
jQuery ClassSelector
var baz = $(".my-baz");
 
pending…
jQuery w. querySelector
var baz = $(document.querySelector(".my-baz"));
pending…
jQuery w. getElementsById
var baz = $(document.getElementById("#bar"));
pending…

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Revisions

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