getElementById vs. querySelector

JavaScript performance comparison

Revision 267 of this test case created by Sandro

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
      
<script>
Benchmark.prototype.setup = function() {
  var q = {
          '#': 'getElementById',
          '.': 'getElementsByClassName',
          '@': 'getElementsByName',
          '=': 'getElementsByTagName',
          '!': 'querySelector',
          '*': 'querySelectorAll'
      };
      window.$ = function(s) {
          var c = q[s[0]];
          return document[c](s.slice(1));
      };

};
</script>

Preparation code output

<p id="foo">Foo</p> <p id="bar">Bar</p> <p id="baz">Baz</p>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
dispatched selector
var bar = $("#bar");
pending…

Revisions

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Foo

Bar

Baz