jQuery .find() vs. context selector

JavaScript performance comparison

Revision 53 of this test case created by

Preparation code

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

<article>
<p>A test</p>
<p><iframe></iframe></p>
<p>This is text</p>
</article>

      
<script>
Benchmark.prototype.setup = function() {
  var article = document.querySelector('article');

};
</script>

Preparation code output

<article> <p>A test</p> <p><iframe></iframe></p> <p>This is text</p> </article>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
find method
var hasFrame = $('iframe').length > 0 ? true : false;
pending…
context method
var hasFrame = $('iframe', article).length > 0 ? true : false;
pending…
pure DOM api
var hasFrame = article.getElementsByTagName('iframe').length > 0 ? true: false;
pending…
test2
var hasFrame = $('article iframe').length > 0 ? true : false;
pending…
test3
var hasFrame = $(document).find('iframe').length > 0 ? true : false;
pending…

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A test

This is text