Benchmark: classList vs setAttribute

HTML Preparation code:

<div id="foo" class="lorem"></div>

Tests:

classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); }
setProperty
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("data-foo", "bar"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
classList
setProperty

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases to understand what's being tested.

**Benchmark Overview**

The benchmark, named "classList vs setAttribute", compares the performance of two approaches: using the `classList` property versus setting an attribute on an HTML element. The goal is to determine which approach is faster in this specific scenario.

**Options Compared**

There are only two options being compared:

1. **`classList`**: This method adds a class to the element without specifying any additional attributes.
2. **`setAttribute`**: This method sets an attribute on the element with the specified value.

**Pros and Cons of Each Approach**

* **`classList`**:
	+ Pros: More efficient, as it doesn't create a new attribute, reducing overhead.
	+ Cons: May not be supported in older browsers or environments that don't understand class lists.
* **`setAttribute`**:
	+ Pros: Widely supported across browsers and environments.
	+ Cons: Creates a new attribute, which can lead to performance overhead.

**Library Usage**

In the benchmark preparation code, there is no library usage. The code only uses standard JavaScript and DOM APIs.

**Special JS Feature or Syntax**

There are no special JS features or syntax used in this benchmark that would require additional explanation.

**Other Alternatives**

In theory, other approaches could be compared to `classList` and `setAttribute`, such as:

* Using a different attribute name (e.g., `data-foo`)
* Using a CSS class instead of an attribute
* Using a custom JavaScript function or library

However, these alternatives are not currently being tested in this benchmark.

**Benchmark Preparation Code**

The provided HTML preparation code creates a simple `<div>` element with the ID "foo" and an empty `class` attribute:
```html
<div id="foo" class="lorem"></div>
```
This is used as a starting point for both test cases, which then perform the respective operations (adding a class using `classList` or setting an attribute using `setAttribute`).

Related benchmarks:

classList vs setAttribute (version: 0)

Comparing performance of: classList vs setProperty

Created: 6 years ago by: Guest

Jump to the latest result

classList

setProperty

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):