jQuery Cached Set

JavaScript performance comparison

Revision 35 of this test case created

Info

Compare performance of cached vs repeated element selections

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<div id="top" class="mydiv">
  <p id="para_1" class="mytext">
    Paragraph one
  </p>
  <p id="para_2" class="mytext">
    Paragraph two
  </p>
  <p id="para_3" class="mytext">
    Paragraph three
  </p>
  <span id="span_1" class="mytext">
    Text in a span
  </span>
</div>
<p id="para_4" class="mytext">
  Paragraph four
</p>
<p id="para_5" class="mytext">
  Paragraph five
</p>
<p id="para_6" class="mytext">
  Paragraph six
</p>
<script>
  var parent_el = document.getElementById("top");
  var cached = jQuery(parent_el).find('p.mytext');
  var cached2 = jQuery('p:eq(0)', parent_el);
</script>

Preparation code output

Paragraph one

Paragraph two

Paragraph three

Text in a span

Paragraph four

Paragraph five

Paragraph six

Test runner

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Testing in unknown unknown
Test Ops/sec
Cached elements
jQuery('p.mytext:eq(0)').css('color', '#ff0000');
jQuery('p.mytext:eq(0)').css('text-decoration', 'underline');
jQuery('p.mytext:eq(0)').css('background-color', '#eeeeee');
pending…
No cache
jQuery('p.mytext:first').css('color', '#ff0000');
jQuery('p.mytext:first').css('text-decoration', 'underline');
jQuery('p.mytext:first').css('background-color', '#eeeeee');
pending…

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