Benchmark: teste adfadsf - MeasureThat.net

HTML Preparation code:

<div><div class="teste" id="teste1">asfasdfafd</div></div>

Tests:

teste a
document.getElementsByClassName(".teste")
teste b
document.querySelector('.teste')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
teste a
teste b

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one month ago):

LLMs can make mistakes. Check important info.

This benchmark tests the performance of two different methods for selecting HTML elements in JavaScript:

**Options Compared:**

* **`document.getElementsByClassName('.teste')`**: This method returns a live NodeList containing all elements with the class name "teste". Live NodeLists update automatically when the DOM changes.

* **`document.querySelector('.teste')`**: This method returns the first element matching the CSS selector ".teste".  It only returns a single element, not a list.

**Pros and Cons:**

| Method         | Pros                                       | Cons                                    |
|----------------|---------------------------------------------|------------------------------------------|
| `getElementsByClassName` |  - Returns multiple elements if there are several matching the class name. <br> - Can be faster for selecting multiple elements.  | - Returns a live NodeList, which can lead to performance overhead if DOM changes are frequent. <br> - Not as versatile as querySelector when needing to target elements based on more complex selectors. |
| `querySelector`   | - More versatile: handles complex CSS selectors. <br>- Returns only the first matching element, potentially saving memory.  | - Only returns a single element, so it's not suitable if you need all matching elements. <br> - Can be slower than getElementsByClassName when selecting multiple elements. |

**Other Considerations:**

* **DOM Structure**: The performance difference between these methods can vary depending on the complexity of your HTML structure and the number of elements with the target class name.
* **Use Case**: If you need to select all elements matching a specific class, `getElementsByClassName` is generally more efficient. If you only need the first match or are using complex selectors, `querySelector` is preferable.

**Alternatives:**

* **Libraries like jQuery**: These libraries provide higher-level methods for selecting and manipulating DOM elements that can often be more performant than native JavaScript methods.

Let me know if you have any other questions about this benchmark or want to explore specific aspects in more detail!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser/OS: Chrome 116 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
teste a	3494256.8 Ops/sec
teste b	2798454.2 Ops/sec

Related benchmarks:

teste adfadsf (version: 0)

teste

Comparing performance of: teste a vs teste b

Created: one year ago by: Guest

Jump to the latest result

teste a

teste b

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one month ago):