Benchmark: querySelectorAll vs filter

HTML Preparation code:

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Tests:

Filter
const divs = document.querySelectorAll( 'div' ); const filtered = Array.from( divs ).filter( ( div ) => div.classList.contains( 'test' ) );
Query selector
const divs = document.querySelectorAll( 'div' ); const filtered = document.querySelectorAll( '.test' )

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Filter
Query selector

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 2 days ago):

LLMs can make mistakes. Check important info.

It seems like you're asking for the performance comparison between two methods of filtering HTML elements.

Based on the provided benchmark definitions and latest benchmark results, here's a summary:

**Method 1: `Array.from(divs).filter((div) => div.classList.contains('test'))`**

* **Benchmark Name:** Filter
* **Raw Benchmark Definition:** `const divs = document.querySelectorAll( 'div' );\r\n\r\nconst filtered = Array.from( divs ).filter( ( div ) => div.classList.contains( 'test' ) );`
* **Latest Result:** ExecutionsPerSecond: 48353.21875

This method uses the `Array.from()` function to convert the NodeList returned by `querySelectorAll()` into an array, and then applies a filter using the `filter()` method.

**Method 2: `document.querySelectorAll('.test')`**

* **Benchmark Name:** Query selector
* **Raw Benchmark Definition:** `const divs = document.querySelectorAll( 'div' );\r\n\r\nconst filtered = document.querySelectorAll( '.test' )`
* **Latest Result:** ExecutionsPerSecond: 3196.610595703125

This method uses the query selector syntax to directly select elements with the class `'test'` from the DOM.

**Comparison:**

The latest benchmark results show that Method 1 (`Filter`) outperforms Method 2 (`Query selector`) by a significant margin, with approximately 15 times fewer executions per second. This suggests that filtering an array of elements using `Array.from()` and `filter()` is more efficient than using the query selector API to select elements directly from the DOM.

However, it's essential to note that this might depend on the specific use case, HTML structure, and browser performance. If you need to filter a large number of elements with different class names, using the query selector syntax might be more suitable due to its flexibility and specificity.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Browser/OS: Chrome 102 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Filter	3196.6 Ops/sec
Query selector	48353.2 Ops/sec

Related benchmarks:

querySelectorAll vs filter (version: 0)

Comparing performance of: Filter vs Query selector

Created: 2 years ago by: Guest

Jump to the latest result

Filter

Query selector

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 2 days ago):