ID DOM lookup

JavaScript performance comparison

Test case created

Preparation code

<div class='a'><div id='b'/></div><script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var $a = $('.a');
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
Straight test lookup
$('#b');
pending…
Stored variable lookup
$a.find('#b');
pending…

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