Benchmark: my simple minded test

HTML Preparation code:

<nav class='nav-submenu'>One</nav>
<nav class='nav-submenu'>Two</nav>
<nav class='nav-submenu'>Three</nav>
<nav class='nav-submenu'>Four</nav>
<nav class='nav-submenu'>Five</nav>

Tests:

getElementsByClassName
var test = document.getElementsByClassName('nav-submenu');
querySelectorAll
var test = document.querySelectorAll('.nav-submenu');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getElementsByClassName
querySelectorAll

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which outlines the setup and purpose of the benchmark. In this case, the benchmark is called "my simple minded test" and its description is "compare". The script preparation code is empty, indicating that no custom JavaScript code needs to be executed before running the benchmark.

However, there's an interesting aspect to the HTML preparation code: it creates a set of HTML navigation elements with classes `nav-submenu`. These elements will likely be used in the subsequent test cases.

**Individual Test Cases**

There are two test cases defined:

1. **getElementsByClassName**: This test case uses the `document.getElementsByClassName` method to retrieve all elements with the class `nav-submenu`.
2. **querySelectorAll**: This test case uses the `document.querySelectorAll` method to select all elements with the class `nav-submenu`.

Both methods are used to achieve a similar goal: retrieving elements based on their CSS classes. However, they differ in how they approach this task.

**Options Compared**

Here's a brief overview of the options compared:

* **getElementsByClassName**: This method returns an HTMLCollection object containing all elements with the specified class name(s). The returned collection is live, meaning that any changes to the DOM will be reflected in the collection.
* **querySelectorAll**: This method returns a NodeList object containing all elements that match the specified CSS selector. Like `getElementsByClassName`, the returned NodeList is also live.

**Pros and Cons**

Here's a summary of the pros and cons of each approach:

* **getElementsByClassName**:
	+ Pros: Can be faster since it uses an internal method to retrieve elements, which might be optimized for performance.
	+ Cons: May not be as flexible or powerful as other methods, especially when dealing with complex CSS selectors.
* **querySelectorAll**:
	+ Pros: More flexible and powerful than `getElementsByClassName`, allowing for more complex CSS selectors and better support for modern web development.
	+ Cons: Might be slower due to the overhead of parsing CSS selectors.

**Library Usage**

There's no explicit library usage in these test cases, but MeasureThat.net might be using its internal implementation details to compare the performance of these methods. Without more context, it's difficult to determine which specific optimizations or features are being utilized.

**Special JS Features/Syntax**

None of the provided benchmark code utilizes any special JavaScript features or syntax that would require additional explanation.

**Other Alternatives**

If you were considering alternatives to `getElementsByClassName` and `querySelectorAll`, here are a few options:

* **Element.query**: An experimental method in modern JavaScript that can be used to select elements using CSS selectors.
* **CSSOM API**: The Web Content Security Policy (CSP) and the HTML5 DOM APIs provide alternative methods for retrieving elements, such as `document.querySelector` and `document.querySelectorAll`.
* **Custom implementations**: Depending on your specific use case, you might need to implement a custom method for retrieving elements based on their CSS classes or other attributes.

Keep in mind that these alternatives may have different performance characteristics, trade-offs in terms of flexibility or maintainability, or may require additional setup and configuration.

Related benchmarks:

my simple minded test (version: 0)

compare

Comparing performance of: getElementsByClassName vs querySelectorAll

Created: 7 years ago by: Guest

Jump to the latest result

getElementsByClassName

querySelectorAll

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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