Benchmark: afsdfadfaasdfadfad

HTML Preparation code:

<div class="test"></div>

Tests:

1
document.querySelector(".test")
2
document.getElementsByClassName(".test")[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Safari/605.1.15

Browser/OS: Safari 13 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
1	3886865.0 Ops/sec
2	3261768.2 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested on the provided JSON and explain the options compared, their pros and cons, as well as other considerations.

**Benchmark Definition**

The benchmark definition is a simple JavaScript code snippet that tests the performance of two different methods to select an element with a class of "test" from a HTML document:

1. `document.querySelector('.test')`
2. `document.getElementsByClassName('test')[0]`

These two methods are used to retrieve a single element from a DOM tree.

**Options Compared**

The two options compared are:

A) `document.querySelector('.test')`: This method uses the `querySelector` function, which is part of the Document Object Model (DOM). It returns the first element that matches the specified selector.

B) `document.getElementsByClassName('test')[0]`: This method uses the `getElementsByClassName` function, which returns a live HTMLCollection of all elements with the matching class name. The `[0]` index is used to retrieve the first element from the collection.

**Pros and Cons**

A) `document.querySelector('.test')`:

Pros:

* Faster execution: Since it's a single operation, it can be faster than retrieving multiple elements using `getElementsByClassName`.
* More efficient: It only returns one element, which reduces the overhead of processing multiple elements.

Cons:

* Less flexible: If you need to retrieve all elements with the same class name, this method won't work.

B) `document.getElementsByClassName('test')[0]`:

Pros:

* More flexible: You can use it to retrieve all elements with the same class name by removing the `[0]` index.
* Works for multiple elements: Since it returns a live HTMLCollection, you can process each element individually.

Cons:

* Slower execution: It needs to traverse the DOM tree to find all matching elements, which can be slower than `querySelector`.
* More overhead: It returns an array of elements, which requires more processing power and memory.

**Other Considerations**

* **Library usage**: The benchmark uses the W3C DOM API, which is a standardized library for interacting with web pages.
* **Special JS features**: Neither option uses any special JavaScript features or syntax that would affect its performance. They are both basic DOM methods that are widely supported by modern browsers.

**Other Alternatives**

If you want to test different elements or classes, you could consider adding more benchmark definitions to the JSON file. For example:

* `document.querySelector('.test')` with a CSS selector (e.g., `.test > .nested`)
* `document.getElementsByClassName('test2')[0]`
* Using a library like jQuery or React to select elements

Keep in mind that these alternatives would require adjusting the benchmark code accordingly.

I hope this explanation helps!

Related benchmarks:

afsdfadfaasdfadfad (version: 0)

Comparing performance of: 1 vs 2

Created: 4 years ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):