Benchmark: className vs. getAttribute vs. classList sadsadasdsasadsadsas

HTML Preparation code:

<div id="foo" class="c1 c2 c3"></div>

Tests:

className
var element = document.getElementById("foo"); for(var i = 0; i < 500; i++) { var z = element.className.split(' '); z.push(i); element.className = z.join(' '); }
classList
var element = document.getElementById("foo"); for(var i = 0; i < 500; i++) { element.classList.add(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
className
classList

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 JSON and explain what's being tested.

**Benchmark Definition**

The benchmark definition is comparing three approaches to update the `class` attribute of an HTML element:

1. **`className`**: Using the `split()` method to split the current class names, adding a new class name, and then joining the updated class names back together.
2. **`getAttribute`**: Not shown in the benchmark definition, but presumably using the `setAttribute()` method to set the value of the `class` attribute.
3. **`classList`**: Using the `classList.add()` method to add a new class name to the element's `classList`.

**Options Compared**

The two options being compared are:

* **`className`**: A manual, string-based approach using the `split()`, `push()`, and `join()` methods.
* **`classList`**: A DOM-based approach using the `classList.add()` method.

**Pros and Cons of Each Approach**

1. **`className`**:
	* Pros: Simple, lightweight, and doesn't require any additional libraries or features.
	* Cons: Can be slower and more verbose than the `classList` approach.
2. **`classList`**:
	* Pros: Faster, more concise, and easier to read than the `className` approach.
	* Cons: Requires support for the `classList` API, which may not be available in older browsers or environments.

**Other Considerations**

The benchmark definition doesn't account for other factors that might affect performance, such as:

* The number of elements being updated
* The complexity of the class names
* Any additional CSS styles or rules that might be applied to the element

**Library Used**

In this case, none of the options are using a specific library. However, if we were to consider the `classList` approach, it's worth noting that the `classList` API is a part of the W3C DOM Standard and has been supported by most modern browsers for several years.

**Special JS Features or Syntax**

None of the options in this benchmark definition rely on any special JavaScript features or syntax. They are all relatively straightforward and easy to understand.

**Alternative Approaches**

Some alternative approaches to updating the `class` attribute might include:

* Using a template engine like Mustache or Handlebars to generate the updated class names.
* Utilizing a CSS preprocessor like Sass or Less to create dynamic styles.
* Employing a more complex DOM manipulation library like jQuery or a custom JavaScript implementation.

It's worth noting that the `classList` approach is generally considered the most efficient and modern way to update class names in HTML elements.

Related benchmarks:

className vs. getAttribute vs. classList sadsadasdsasadsadsas (version: 0)

Comparing performance of: className vs classList

Created: 5 years ago by: Guest

Jump to the latest result

className

classList

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):