Benchmark: classListFighter vs classNameFighter

HTML Preparation code:

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

Tests:

classNameFighter
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className += `bar${i}`; }
classListFighter
var element = document.getElementById("foo"); var i = 1000; var cl = element.classList; while (i--) { cl.add(`foo${i}`); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
classNameFighter
classListFighter

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.

I'll explain the benchmark and its options in detail.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test created on MeasureThat.net. The benchmark compares two approaches to add classes to an HTML element: using `className` property (denoted as "classNameFighter") and using `classList` API (denoted as "classListFighter").

**Options Compared**

The two options being compared are:

1. **`element.className += 'bar' + i`**: This approach uses the `className` property to add classes to the element. It concatenates a string with the class name, which may lead to performance issues due to string interning and caching.
2. **`cl.add('foo' + i)`**: This approach uses the `classList` API, which is a more modern and efficient way of managing classes on elements. It adds a single class to the element without concatenating strings.

**Pros and Cons**

1. **`element.className += 'bar' + i`**:
	* Pros: Simple and easy to understand.
	* Cons:
		+ May lead to performance issues due to string interning and caching.
		+ Does not take advantage of the `classList` API.
2. **`cl.add('foo' + i)`**:
	* Pros:
		+ More efficient, as it uses a single class addition operation.
		+ Takes advantage of the `classList` API, which is optimized for performance.
	* Cons:
		+ May require more complex code to manage classes.

**Library and Purpose**

The `classList` API is a part of the HTML DOM specification, introduced in HTML5. It provides an efficient way to add and remove classes from elements, with methods like `add`, `remove`, and `toggle`. The `cl` variable in the benchmark refers to this API.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark. However, it's worth noting that older browsers may not support the `classList` API, which could affect the test results.

**Alternative Approaches**

Other approaches to add classes to an element might include:

1. **Using `style` property**: `element.style += 'bar' + i`. This approach uses the `style` property to set a CSS style attribute on the element.
2. **Using `setAttribute` method**: `element.setAttribute('class', 'foo' + i)`. This approach uses the `setAttribute` method to set the class attribute directly.

However, these approaches may not be as efficient or modern as using the `classList` API.

Related benchmarks:

classListFighter vs classNameFighter (version: 0)

Comparing performance of: classNameFighter vs classListFighter

Created: 5 years ago by: Guest

Jump to the latest result

classNameFighter

classListFighter

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):