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querySelector vs Closest!!
(version: 0)
Comparing performance of:
Closest? vs querySelector?
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div><div><div> <div data-parent="parent-id"> <div><div> <div data-target="target-id"> <div><div> <div data-clicked="clicked-id"></div> </div></div> </div> </div></div> </div> </div></div></div>
Tests:
Closest?
document.querySelector('[data-parent="parent-id"]').closest('[data-clicked="clicked-id"]')
querySelector?
document.querySelector('[data-parent="parent-id"]').querySelector('[data-clicked="clicked-id"]')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Closest?
querySelector?
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0
Browser/OS:
Firefox 135 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=591496" width="100%" height="500px"></iframe>
querySelector?
1.4M/s
Closest?
1.3M/s
View exact numbers
Test name
Executions per second
✓
querySelector?
1,416,411 Ops/sec
Closest?
1,347,006 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Overview** The benchmark compares two approaches to selecting elements in HTML documents: `querySelector` and `closest`. The test cases are designed to measure the performance difference between these two methods on a complex HTML structure. **Options Compared** The two options being compared are: 1. **`querySelector`**: This method is used to select an element by its CSS selector. It's a widely supported and efficient way to navigate the DOM. 2. **`closest`**: This method is used to find the closest ancestor of a given element that matches a specified selector. It's often used in conjunction with `querySelector` to traverse the DOM. **Pros and Cons** * **`querySelector`**: + Pros: Efficient, widely supported, and easy to use. + Cons: May not be suitable for complex queries or large documents, as it can lead to slower performance. * **`closest`**: + Pros: Can be faster than `querySelector` in some cases, especially when searching for a specific ancestor element. + Cons: Requires additional processing to find the closest ancestor, which may add overhead. **Library and Purpose** In the provided benchmark, no external libraries are used. The test cases rely on native JavaScript methods for DOM manipulation. **Special JS Feature or Syntax** There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that `closest` was introduced in modern browsers as a polyfill for older versions of Internet Explorer. **Benchmark Preparation Code and Definition** The benchmark preparation code generates an HTML structure with nested elements, which serves as the test environment. The HTML structure includes various attributes (e.g., `data-parent`, `data-target`, and `data-clicked`) that are used in the test cases to simulate real-world scenarios. **Other Alternatives** If you're interested in exploring alternative approaches for DOM selection, here are a few options: * **`getElementsByClassName`**: This method can be faster than `querySelector` when searching for elements with a specific class name. * **`document.querySelectorAll`**: This method is similar to `querySelector`, but returns an array of matching elements instead of a single element. * **`CSS Selectors`**: Some browsers support CSS selectors in their native JavaScript APIs. For example, you can use the `getElementsByTagName` method with a CSS selector to select elements. Keep in mind that each approach has its own strengths and weaknesses, and the choice ultimately depends on your specific use case and performance requirements.
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