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Native JS classList versus Native JS getAttribute
(version: 0)
Comparing performance of:
classList vs getAttribute
Created:
6 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div class="testClass">Test TEXT here</div>
Tests:
classList
document.querySelector('div').classList
getAttribute
document.querySelector('div').getAttribute('class')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
classList
getAttribute
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
5 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.0
Browser/OS:
Firefox 147 on Mac OS X 10.15
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<iframe src="https://measurethat.net/Embed?id=625323" width="100%" height="500px"></iframe>
classList
7.9M/s
getAttribute
7.8M/s
View exact numbers
Test name
Executions per second
✓
classList
7,853,556 Ops/sec
getAttribute
7,784,654 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in this benchmark. The test is comparing two approaches to get the `class` attribute of an HTML element in JavaScript: 1. **Native JS classList**: This approach uses the built-in `classList` property of HTML elements, which allows you to access and manipulate the class names of an element. 2. **Native JS getAttribute**: This approach uses the `getAttribute()` method of the DOM element, which returns the value of a specified attribute. Here's what's being tested: * For each test case (one for `classList` and one for `getAttribute`), we're measuring the execution time of both approaches on different browsers. * The test cases are designed to simulate a typical use case: selecting an HTML element and accessing its class names or attribute value. **Pros and Cons of each approach:** 1. **Native JS classList**: This approach is generally faster because it's implemented in native code, which means it bypasses the interpreter and can run more efficiently. * Pros: + Faster execution time + More memory-efficient * Cons: + May not work with older browsers or non-standard HTML elements + Can be less intuitive for developers who are used to using `getAttribute()` 2. **Native JS getAttribute**: This approach is more widely supported, as it's a standard method in the DOM API. * Pros: + Works across most browsers and devices + More intuitive for developers * Cons: + May be slower than `classList` due to the interpreter overhead **Library usage:** In this benchmark, we don't use any external libraries. The `classList` property is a built-in feature of HTML elements in modern browsers. **Special JS features or syntax:** This benchmark doesn't require any special JavaScript features or syntax beyond what's available in modern browsers (ECMAScript 2015+). **Other alternatives:** If you wanted to test other approaches, here are some alternatives: * Using a library like jQuery or Lodash, which provide additional utility functions for working with DOM elements. * Implementing your own custom solution using JavaScript and CSS. * Testing the performance of `classList` versus `getAttribute()` in older browsers that may not support these features. It's worth noting that the use cases where one approach might be preferred over the other depend on specific requirements, such as: * Speed-critical applications * Legacy browser support * Code readability and maintainability In general, when working with HTML elements, using `classList` is a more modern and efficient way to access class names. However, in some cases, `getAttribute()` might be a better choice due to its wider browser support or specific requirements.
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