jQuery vs. document.querySelector

JavaScript performance comparison

Test case created by Lee Brimelow

Info

I know its been done before. Just want to see for myself

Preparation code

<div id="main">
  <ul class="gallery">
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
  </ul>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.teardown = function() {
    var el = document.querySelector("#main ul:first-child");
    el.style.display = "list-item";
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery
$("#main ul:first-child").hide();
pending…
DOM
var el = document.querySelector("#main ul:first-child");
el.style.display = "none";
pending…

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4 comments

Samuel Ondrek commented :

Nice! This test exactly I'm trying to find :) Thanks Lee.

Samuel Ondrek commented :

I used yours sample, in my blog. FYI.

olvlvl commented :

Hi Lee,

Isn't the call to the hide() method impacting performances ? The following code might be fairer:

var els = $("#main ul:first-child");
els[0].style.display = "none";

Or better, don't change the display.

dfg commented :

dfsgdfs

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