Attribute vs Class selection

JavaScript performance comparison

Revision 17 of this test case created

Info

Tests speed of selection for data attribute selection versus class-based selection.

Preparation code

<div class="a1" id="parent">
<div class="a1">
<div class="a1">
<div class="a1">
<div class="a1">
<div class="a1">
<div class="a1">
<ul id="list">
<li id="1" data-cargroup="A" class="js-CarGroup">A</li>
<li id="2" data-cargroup="B" class="js-CarGroup">B</li>
<li id="3" data-cargroup="C" class="js-CarGroup">C</li>
<li id="4" data-cargroup="C" class="js-CarGroup">C</li>
<li id="5" data-cargroup="D" class="js-CarGroup">D</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
Benchmark.prototype.setup = function() {
    var listElement = $('#list')
};
</script>

Preparation code output

  • A
  • B
  • C
  • C
  • D

Test runner

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Testing in unknown unknown
Test Ops/sec
class selection
$('.js-CarGroup');
pending…
ID selection
$('#list .js-CarGroup');
pending…
ID context
$('.js-CarGroup','#list')
pending…
Element context
$('.js-CarGroup',listElement)
pending…

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Revisions

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