jquery-element-class

JavaScript performance comparison

Test case created by Joshua Cody and last updated

Info

Determine whether or not prefacing a class-name with an element name achieves any performance boost with jQuery selectors.

Hypothesis: like in CSS, adding an element name to the class name will not provide any performance boost, because selectors are evaluated right-to-left. Also, pseudo-selectors are slow.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div class="visible">
<p>Shown</p>
</div>

Preparation code output

Shown

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Testing in unknown unknown
Test Ops/sec
Selector Plus Class
$("div.visible").hide();
pending…
Class Only
$(".visible").hide();
pending…
Pseudo Class
$(".visible:visible").hide();
pending…

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