Benchmark: querySelect speed 2

HTML Preparation code:

<img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/><img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/><img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/><img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/><img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/>
<img src="" class="slide-image-entity"/>

Tests:

1
document.querySelectorAll("img[class^='slide-image-entity'");
2
document.getElementsByClassName("slide-image-entity")

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: 8 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser/OS: Chrome 139 on Windows

View result in a separate tab

Test name	Executions per second
1	712740.0 Ops/sec
2	13706379.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and explain what's being tested.

**Benchmark Definition:**
The benchmark definition is a JavaScript code snippet that queries an HTML document for elements with a specific class using two different methods:

1. `document.querySelectorAll("img[class^='slide-image-entity']");`
2. `document.getElementsByClassName("slide-image-entity")`

These two approaches are compared to measure their performance.

**Options Compared:**

* `querySelectorAll` vs `getElementsByClassName`

**Pros and Cons of Each Approach:**

* `querySelectorAll`:
	+ Pros:
		- More flexible and powerful, as it allows for CSS selectors with attributes (e.g., `[class^='slide-image-entity']`).
		- Can be used to select elements based on their position in the DOM.
		- Returns a NodeList, which can be accessed like an array.
	+ Cons:
		- May have performance overhead due to the complexity of the CSS selector.
* `getElementsByClassName`:
	+ Pros:
		- Simpler and more lightweight than `querySelectorAll`.
		- Faster execution, as it uses a simple string comparison.
	+ Cons:
		- Less flexible and powerful than `querySelectorAll`, as it only allows for class names to be specified.

**Library/Functionality Used:**

None of the provided benchmark code snippet explicitly references a library or framework. However, if we assume that this benchmark is intended to measure the performance of JavaScript engines, then:

* `document.querySelectorAll` and `document.getElementsByClassName` are built-in DOM methods implemented by JavaScript engines (e.g., V8 in Chrome).

**Special JS Features/Syntax:**

None of the provided code snippet utilizes any special JavaScript features or syntax.

**Other Alternatives:**

If you're looking for alternative ways to query elements, consider using:

* `querySelector` (a subset of `querySelectorAll`, which allows for only class names to be specified).
* CSS APIs like `CSSOM` (e.g., `CSSQuerySelector`) for more complex queries.
* Framework-specific solutions (if applicable).

Keep in mind that the choice of query method depends on the specific use case and performance requirements.

In this benchmark, the goal is to measure the performance difference between two common DOM querying methods. The results can help developers understand which approach is faster and more suitable for their specific needs.

Related benchmarks:

querySelect speed 2 (version: 0)

Comparing performance of: 1 vs 2

Created: 2 years ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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