Pure js hasClass vs jQuery hasclass

JavaScript performance comparison

Revision 35 of this test case created by tomin

Info

Additional comparison of className and getAttribute("class")

Preparation code

<div class="someClass" id="someElement"></div><script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
  var el = document.getElementById('someElement');
 
function hasClass(elem, className) {
    return new RegExp(' ' + className + ' ').test(' ' + elem.getAttribute("class") + ' ');
}

function hasClass2(elem, className) {
        return ((" " + elem.getAttribute("class") + " ").replace(/[\n\t\r]/g, " ").indexOf(" " + className + " ") > -1);
}
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery
$(el).hasClass('someClass');
pending…
regex
hasClass(el, 'someClass');
pending…
nonregex
hasClass2(el, 'someClass');
pending…

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