classList v old way

JavaScript performance comparison

Test case created by Rick Waldron

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div data-fixture id="a"></div>
<div data-fixture id="b"></div>

<script>

var a = document.getElementById("a"),
    b = $("#b");

</script>
<script>
Benchmark.prototype.teardown = function() {
    $("[data-fixture]").attr("class", "");
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
classList
for (var i = 0; i < 5; i++ ) {
  a.classList.add("foo" + i);
}
pending…
jQuery
b.addClass("foo0 foo1 foo2 foo3 foo4");
pending…

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