Pure js hasClass vs jQuery hasclass

JavaScript performance comparison

Revision 17 of this test case created

Info

Additional comparison of className

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(el, selector) {
    var className = " " + selector + " ";

    if ((" " + el.className + " ").replace(/[\n\t]/g, " ").indexOf(className) > -1) {
      return true;
    }


    return false;
  }

  function hasClass2(el, selector) {
    var className = " " + selector + " ";
    var elemClassName = el.getAttribute("class");
    if ((" " + elemClassName + " ").replace(/[\n\t]/g, " ").indexOf(className) > -1) {
      return true;
    }

    return false;
  }

  function hasClass3(el, cls) {
    return (new RegExp("(^|\\s)" + cls + "(\\s|$)")).test(el.className);
  }
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery
// async test
$(el).hasClass('someClass');
pending…
Pure JS (className)
// async test
hasClass(el, 'someClass');
pending…
Pure JS (getAttribute)
// async test
hasClass2(el, 'someClass');
pending…
RegExp
// async test
function hasClass3(el, 'someClass');
pending…

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