jQuery selector vs getElementsByTagName

JavaScript performance comparison

Test case created by macem

Preparation code

<div class="pane">
<ul>
<li class="list"><a href="#">test</a></li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
</ul>
</div>

<div class="pane">
<ul>
<li class="list"><a href="#">test</a></li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
<li class="list">test</li>
</ul>
</div><script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<script>
  $.fn.tags = function (tagName) {
        var i=this.length, arr=[], parent;
        for (i;i--;) {
                arr.push (this[i].getElementsByTagName (tagName));
        }
        return $(arr);
  };
 
  var $links = $('.pane a'), $nodes;
</script>

Preparation code output

  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test
  • test

Test runner

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Testing in unknown unknown
Test Ops/sec
jQuery
$nodes = $('.pane li');
pending…
jQuery method with getElementsByTagName
$nodes = $('.pane').tags('li');
pending…

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