getElementById vs. querySelector (v98)

Revision 98 of this benchmark created on

Description

Compare the speed of getElementById to querySelector

Preparation HTML

<script src="https://code.jquery.com/jquery-git2.min.js"></script>

<p id="foo">Foo</p>
<p id="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);
    };
    
    var idCheck = /^#\S+$/i;
    function getID(id){
      return document.getElementById(id);
    }
    
    function getID2(query){
      if (idCheck.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.getElementById("bar");
ready
querySelector
var bar = document.querySelector("#bar");
ready
mapping to getElementById
var bar = select("#bar");
ready
getID
var bar = getID("bar");
ready
getID2
var bar = getID2("#bar");
ready

Revisions

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