jQUery Selectors vs Native API

JavaScript performance comparison

Revision 15 of this test case created by mike

Preparation code

<div id="testid"></div>
<div class="testclass"></div>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
 

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery ID Selector
$("#testid");
pending…
getElementById
document.getElementById("testid");
pending…
jQuery class Selector
$(".testclass");
pending…
Native querySelector
document.querySelector(".testclass");
pending…
Create jQuery from Native
$(document.getElementById("testid"));
pending…
Native querySelector to jQuery Object
$(document.querySelector(".testclass"));
pending…
jQuery class Selector with tag
$("div.testclass");
pending…
jQuery id with class selector
$("#testid.testclass");
pending…
var getArrayFromTag = function(idElement, tagname) {
  //get the NodeList and transform it into an array
  return Array.prototype.slice.call(idElement.getElementsByTagName(tagname));
}

//Get the arrays
var child_inputs = getArrayFromTag(document.getElementById("testid"), 'div');
pending…

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