Parent vs String Concat

JavaScript performance comparison

Test case created by Greg

Info

Is it faster to inspect the id of an element and then use that to construct the id of a parent, or is it faster to use ancestry?

Preparation code

<div id="selectTop">
    <div>
        <div id="select">The Selector</div>
    </div>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var thisId;
};

Benchmark.prototype.teardown = function() {
    var thisId = null;
};
</script>

Preparation code output

The Selector

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
Select By Parent
var thisId = $("#select").parent().parent()[0].id;
pending…
Select By Text Concat
var thisId = $("#" + $("#select")[0].id + "Top")[0].id;
pending…

You can edit these tests or add even more tests to this page by appending /edit to the URL.

Compare results of other browsers

0 comments

Add a comment