getElementsByTagname("a")[0] vs. querySelector("a")

JavaScript performance comparison

Revision 31 of this test case created by

Preparation code

<ul>
<li><a href="#">Item</a></li><li><a href="#">Item</a></li><li><a href="#">Item</a></li><li><a href="#">Item</a></li><li><a href="#">Item</a></li></ul>
<script>
  var result;
</script>
      
<script>
Benchmark.prototype.setup = function() {
  window.$ = document.querySelectorAll;

};
</script>

Preparation code output

<ul> <li><a href="#">Item</a></li><li><a href="#">Item</a></li><li><a href="#">Item</a></li><li><a href="#">Item</a></li><li><a href="#">Item</a></li></ul>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Using getElementsByTagName()
result = document.getElementsByTagName("a");
pending…
Using querySelector()
result = $("a");
pending…

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Revisions

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