Benchmark: Ponyfill vs classList test

HTML Preparation code:

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

Script Preparation code:

function addClass(element, name) {
    const orig = '' + element.className;
 	if (orig.indexOf(name) > -1) {
        element.setAttribute('class', name + ' ' + orig);
    }
}

function removeClass(element, name) {
    element.setAttribute('class', ('' + element.className).replace(name, '').trim());
}

Tests:

ponyfill
var element = document.getElementById("foo"); var i = 1000; while (i--) { addClass(element, "bar"); removeClass(element, "bar"); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); element.classList.remove("bar"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ponyfill
classList

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The test aims to compare the performance of two approaches for adding and removing classes from an HTML element in JavaScript:

1. **Ponyfill**: This approach uses a custom function `addClass` and `removeClass` to manipulate the `className` property directly.
2. **classList**: This approach leverages the native `classList` API, which is supported by most modern browsers.

**Options Compared**

The benchmark tests the performance of these two approaches under the same conditions:

* Number of executions: 1000 iterations
* Element creation: A single `<div>` element is created and assigned to the `element` variable.
* Class names: The same class name `"bar"` is added and removed repeatedly.

**Pros and Cons**

### Ponyfill Approach

Pros:

* Wide browser support (no polyfills required)
* Simple implementation
* Can be easily modified or extended

Cons:

* May not perform as well as native `classList` API for large-scale operations
* Requires manual string manipulation, which can lead to errors

### ClassList Approach

Pros:

* Native performance and scalability
* Less prone to errors due to built-in validation and automatic class name deduplication

Cons:

* Limited browser support (older browsers may not have this feature)
* Requires a polyfill for older browsers

**Library and Feature**

The `classList` API is a part of the W3C's HTML5 specification. It provides a simple way to manage classes on an element, making it easier to add, remove, or toggle classes.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The test focuses solely on comparing the performance of two approaches for adding and removing classes from an HTML element.

**Alternatives**

Other alternatives for managing classes on an element include:

* Using inline styles with CSS class names (e.g., `element.style = 'class: bar';`)
* Utilizing libraries like jQuery or Lodash, which provide class management functionality
* Implementing custom class management solutions using vanilla JavaScript

Keep in mind that the choice of approach depends on the specific use case, browser requirements, and personal preference.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Browser/OS: Chrome 68 on Windows

View result in a separate tab

Test name	Executions per second
ponyfill	1481.6 Ops/sec
classList	681.7 Ops/sec

Related benchmarks:

Ponyfill vs classList test (version: 1)

Comparing performance of: ponyfill vs classList

Created: 6 years ago by: Registered User

Jump to the latest result

ponyfill

classList

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):