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window.getComputedStyle (no props requested) vs. classList.contains
(version: 0)
Comparing performance of:
getComputedStyle vs className
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<div id="foo"></div>
Tests:
getComputedStyle
var i = 3000; while (i--) { chekele('foo'); } function chekele(element) { return window.getComputedStyle(document.getElementById(element), null); }
className
var i = 3000; while (i--) { chekele('foo'); } function chekele(element) { return document.getElementById(element).classList.contains('hide'); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
getComputedStyle
className
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmark. **Benchmark Overview** The test compares two approaches to check if an HTML element has a certain class: `window.getComputedStyle(document.getElementById(element), null).classList.contains('hide')` and `document.getElementById(element).classList.contains('hide')`. The goal is to determine which method is faster, but it's not the only consideration. **Options Compared** The benchmark compares two options: 1. **Using `window.getComputedStyle`**: This approach involves using the `getComputedStyle` function from the window object to retrieve the computed style of an element. It then extracts the class list from the computed style and checks if 'hide' is in it. 2. **Using the `classList.contains` method directly on the element**: This approach uses the `classList` property of the element itself to check if 'hide' is in its class list. **Pros and Cons** * **Using `window.getComputedStyle`**: + Pros: This approach allows for more flexibility, as it provides access to other CSS properties and values. However, it's slower because it involves a function call and potentially additional computations. + Cons: It's an older API that may be less efficient than the modern alternative. * **Using the `classList.contains` method directly on the element**: + Pros: This approach is more straightforward and likely to be faster, as it only involves a simple property access. However, it might not provide access to other CSS properties or values. + Cons: It's tied to the specific implementation of `classList` in browsers, which may change over time. **Library/Feature Consideration** Neither of these options relies on any external libraries, and they both use built-in JavaScript features. **Special JS Feature/Syntax** The benchmark uses a feature that's widely supported in modern JavaScript engines: the `.contains()` method for arrays (in this case, `classList`). **Other Alternatives** If you need to check if an element has a certain class in a more efficient way, you could consider: * Using `const classes = window.getComputedStyle(document.getElementById(element)).classList;` and then using `classes.contains('hide')`. This approach is likely to be faster because it avoids the overhead of repeated function calls. * Using a library like jQuery or a similar DOM manipulation library that provides a more efficient way to manipulate elements. However, keep in mind that these alternatives might introduce additional dependencies or complexity.
Related benchmarks:
window.getComputedStyle vs. classList.contains
window.getComputedStyle vs. className vs. classList
window.getComputedStyle vs. className vs. classList 2
computedStyleMap vs getComputedStyle
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