getElementByClass[0] vs. querySelector

JavaScript performance comparison

Revision 34 of this test case created by AjiTae

Info

Compare the speed of getElementByClassName to querySelector

Preparation code

<p class="test">Foo</p>
<p class="test">Baz</p>
<p class="test">Bar</p>
<p class="test">Foo</p>
<p class="test">Baz</p>
<p class="test">Bar</p>
<p class="test">Foo</p>
<p class="test">Baz</p>
<p class="test">Bar</p>
 

Preparation code output

Foo

Baz

Bar

Foo

Baz

Bar

Foo

Baz

Bar

Test runner

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Testing in unknown unknown
Test Ops/sec
getElementsByClassName
var bar = document.getElementsByClassName("test")[0];
pending…
querySelector
var bar = document.querySelector(".test");
pending…

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Revisions

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