getElementById vs. querySelector (v124)

Revision 124 of this benchmark created on

Description

Compare the speed of getElementById to querySelector

Preparation HTML

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

Setup

var idSelectorRegexp = /^#[a-zA-Z]+[a-zA-Z0-9_\-]*$/;
    
    var select = function(query){
      // pure ID selector?
      if (idSelectorRegexp.test(query))
        return document.getElementById(query.slice(1));
      else
        return document.querySelector(query);
    };

Test runner

Ready to run.

Testing in
TestOps/sec
getElementById
var bar = document.getElementsByClassName("bar")[0];
ready
querySelector
var bar = document.querySelector(".bar");
ready
mapping to getElementById
var bar = select("#bar");
ready

Revisions

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