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getElementsByTagName vs querySelectorAll
(version: 0)
Benchmark.js
Comparing performance of:
getElementsByTagName vs QueryselectorAll
Created:
4 years ago
by:
Registered User
Go to the latest result
HTML Preparation code:
<ul id="list"> <li>Item 1</li> <li>Item 2</li> <li>Item 3</li> <li>Item 4</li> </ul>
Script Preparation code:
const list = document.getElementById('list')
Tests:
getElementsByTagName
list.getElementsByTagName('li');
QueryselectorAll
list.querySelectorAll('li')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
getElementsByTagName
QueryselectorAll
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0
Browser/OS:
Firefox 149 on Linux
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Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=628837" width="100%" height="500px"></iframe>
getElementsByTagName
1365.5M/s
QueryselectorAll
2.8M/s
View exact numbers
Test name
Executions per second
✓
getElementsByTagName
1,365,535,104 Ops/sec
QueryselectorAll
2,751,643 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Benchmark Definition** The benchmark defines two test cases: 1. `getElementsByTagName`: Tests the performance of the `getElementsByTagName` method, which is used to get an HTMLCollection of elements with a specific tag name (in this case, "li"). 2. `QueryselectorAll`: Tests the performance of the `querySelectorAll` method, which is used to get an NodeList of elements that match a CSS selector (in this case, `"li"`). **Options Compared** The benchmark compares two approaches: 1. **getElementsByTagName**: This approach uses the `getElementsByTagName` method to retrieve the elements. It's a traditional and widely supported method for getting HTML elements. 2. **QueryselectorAll**: This approach uses the `querySelectorAll` method to retrieve the elements. It's a more modern and flexible alternative to `getElementsByTagName`. **Pros and Cons** Here are some pros and cons of each approach: * **getElementsByTagName** + Pros: Widely supported, easy to use, and well-documented. + Cons: Can be slower than `querySelectorAll` for larger datasets, as it returns an HTMLCollection which is not optimized for performance. * **QueryselectorAll** + Pros: Faster than `getElementsByTagName` for larger datasets, more flexible, and modern. + Cons: May not work in older browsers that don't support CSS selectors. **Library/Feature Used** In this benchmark, the following library feature is used: * **CSS selectors**: The `querySelectorAll` method uses CSS selectors to match elements. In this case, `"li"` is used as a selector. **Special JS Feature/Syntax** There are no special JavaScript features or syntaxes mentioned in this benchmark. **Other Alternatives** If you're looking for alternative approaches, here are some options: * **getElementsByClassName**: This method returns an HTMLCollection of elements with the specified class name. It's similar to `getElementsByTagName`, but can be faster for larger datasets. * **querySelector**: This method returns a NodeList of elements that match the specified CSS selector. It's similar to `querySelectorAll`, but returns a single element instead of a collection. **Additional Considerations** When choosing between these approaches, consider the following factors: * Browser support: If you need to support older browsers, `getElementsByTagName` might be a better choice. * Performance: For larger datasets, `QueryselectorAll` and `getElementsByClassName` can be faster than `getElementsByTagName`. * Flexibility: `QueryselectorAll` is more flexible than `getElementsByTagName`, as it allows for more complex selectors. I hope this explanation helps!
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