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getAttribute(...) vs classList.value vs className
(version: 0)
Comparing performance of:
getAttribute(...) vs classList.value vs className
Created:
2 years ago
by:
Guest
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HTML Preparation code:
<div id="foo", class="foo bar baz"></div>
Tests:
getAttribute(...)
var element = document.getElementById("foo"); var i = 100; while (i--) { element.getAttribute("class"); }
classList.value
var element = document.getElementById("foo"); var i = 100; while (i--) { element.classList.value; }
className
var element = document.getElementById("foo"); var i = 100; while (i--) { element.className; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
getAttribute(...)
classList.value
className
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring the performance of different approaches to retrieve and manipulate an element's class list is an interesting benchmark. **What is being tested:** The provided JSON represents three individual test cases, each measuring the performance of retrieving and manipulating an element's class list using: 1. `getAttribute("class")` 2. `classList.value` (via the `classList` property on the `Element` object) 3. `className` (via the `className` property on the `Element` object) **Options being compared:** The benchmark is comparing the performance of these three approaches: * **`getAttribute("class")`**: This method retrieves the value of the `class` attribute of an element. * **`classList.value`**: This method returns a string containing all the classes of the element, using the `classList` property on the `Element` object. * **`className`**: This method returns a string containing all the classes of the element as CSS class names. **Pros and Cons:** 1. **`getAttribute("class")`**: * Pros: Simple, widely supported, and works across older browsers that don't support the `classList` property. * Cons: Returns only the value of the `class` attribute, without any additional information about the classes themselves. 2. **`classList.value`**: * Pros: Returns a string containing all the classes of the element, making it easier to manipulate class lists. * Cons: Requires modern browsers that support the `classList` property, which might not be the case for older users or browsers. 3. **`className`**: * Pros: Similar to `classList.value`, but with a more traditional approach using CSS class names. * Cons: Less straightforward than `classList.value`, as it requires parsing the string returned by this method. **Library and syntax considerations:** None of these test cases rely on specific libraries or syntax features that are not part of standard JavaScript or DOM APIs. **Other alternatives:** If you want to explore alternative approaches, here are a few options: * Using `getComputedStyle()` to retrieve the CSS styles for an element and then parsing them to extract class names. * Creating a custom function to parse the `class` attribute or `className` property into an array of classes. Keep in mind that these alternatives might not be as efficient or straightforward as the methods being compared in this benchmark.
Related benchmarks:
className vs. setAttribute vs. classList
classList.contains vs. hasAttribute
Native JS classList versus Native JS getAttribute
setAttribute(...) vs. classList.add(...) vs classList.value vs className (multiple classes, no override)
classList.add vs setAttribute
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