Why cache jQuery selectors?

JavaScript performance comparison

Test case created by C. Spencer Beggs

Preparation code

<div id="bar"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

    

Preparation code output

<div id="bar"></div>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Cached
$(document).ready(function() {
  var foo = $("#bar");
  foo.attr("style", "color: black;");
  foo.attr("class", "foo");
});
pending…
Not cached
$(document).ready(function() {
  $("#bar").attr("style", "color: black;");
  $("#bar").attr("class", "foo");
});
pending…

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