getElementById vs. querySelector

JavaScript performance comparison

Revision 247 of this test case created by

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
      
<script>
Benchmark.prototype.setup = function() {
  var select = function(query){
    // pure ID selector?
    if (query[0] === '#')
      return document.getElementById(query.slice(1));
    else
      return document.querySelector(query);
  };

};
</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
getElementById
var bar = document.getElementById("bar");
pending…
querySelector
var bar = document.querySelector("#bar");
pending…
mapping to getElementById
var bar = select("#bar");
pending…

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Revisions

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Foo

Bar

Baz