Calling $() every time

JavaScript performance comparison

Test case created by Baptiste Fontaine

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var $win = $(window),
        $doc = $(document),
   
        do_something = function(){};
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
Calling every time
if($(window).scrollTop() + $(window).height() == $(document).height()) {
      do_something();
}
pending…
Caching
if($win.scrollTop() + $win.height() == $doc.height()) {
      do_something();
}
pending…

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