getElementById vs. querySelector

JavaScript performance comparison

Revision 64 of this test case created

Info

Compare the speed of getElementById to querySelector

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
<script src="//cdnjs.cloudflare.com/ajax/libs/zepto/1.0/zepto.min.js"></script>
<script>
Benchmark.prototype.setup = function() {
    var $$ = function(e,f,g){
         
          return document[(e)?"getElementById":(f)?"getElementsByClassName":"getElementsByTagName"]((e)?e:(f)?f:g);
    }
};

Benchmark.prototype.teardown = function() {
    console.log(bar);
};
</script>

Preparation code output

Foo

Bar

Baz

Test runner

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Testing in unknown unknown
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector
var bar = document.querySelector("#bar");
pending…
easySyntax
var bar = $$(null,null,"p");
pending…
Zepto
var bar = $("#bar");
pending…

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