Benchmark: Test selectors - MeasureThat.net

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js">
</script>
<div>
  <ul>
    <li>
      <a href="#" name="name" class="classname">item 1</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 2</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 3</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 4</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 5</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 6</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 7</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 8</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 9</a>
    </li>
    <li id="last">
      <a href="#" name="name" class="classname">item 10</a>
    </li>
  </ul>
</div>

Script Preparation code:

var node;

Tests:

Directly
node = $('.classname');
Via attr
node = $('[class*="classname"');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Directly
Via attr

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 Purpose**
The primary goal of this benchmark is to compare the performance of two different approaches for selecting elements from an HTML document using JavaScript.

**Options Being Compared**

1. **Directly**: This approach uses jQuery's `$('.classname')` method to select all elements with the class `classname`.
2. **Via attr**: This approach uses the `[class*="classname"]` attribute selector to find elements that have any character string as their value for the class attribute, which then includes the class name.

**Pros and Cons of Each Approach**

1. **Directly (jQuery's `$('.classname')`)**
	* Pros:
		+ Easy to read and maintain.
		+ Well-documented and widely supported.
	* Cons:
		+ May have slower performance compared to attribute selectors, especially for large datasets.
		+ Requires jQuery library, which might add overhead.
2. **Via attr ([class*="classname"]**)
	* Pros:
		+ Can be faster than using the class selector, as it doesn't require a full DOM traversal.
		+ More efficient when dealing with large datasets or complex selectors.
	* Cons:
		+ Less readable and maintainable compared to the class selector approach.
		+ May not work correctly in older browsers that don't support attribute selectors.

**Library and Purpose**
The `jQuery` library is used in this benchmark. It's a popular JavaScript library that simplifies DOM interactions, making it easier to find elements on a webpage. In this case, jQuery provides an efficient way to select elements using its class selector (`$('.classname')`).

**Special JS Features or Syntax**
No special features or syntax are being tested in this benchmark. The focus is solely on comparing the performance of two different approaches for selecting elements.

**Other Considerations**

1. **Browser Variability**: MeasureThat.net provides raw UA strings, which help identify the browser type and version used to run each test case. This information can be useful for understanding potential differences in performance between browsers.
2. **Device Platform and Operating System**: The benchmark also takes into account device platform (Desktop vs. other) and operating system (Ubuntu). These factors might influence performance due to varying hardware configurations, operating system features, or software optimizations.

**Alternatives**

If you're interested in exploring alternative approaches for element selection, consider the following:

1. **Vanilla JavaScript**: You can use vanilla JavaScript methods like `document.querySelectorAll()` or `getElementsByClassName()` to select elements.
2. **CSS Selectors**: CSS selectors are a powerful way to target elements on a webpage without relying on JavaScript libraries. However, they may require additional code and might not be as efficient for complex selections.
3. **Libraries with Better Performance**: Other libraries like Sizzle or jQuery-like alternatives might provide better performance compared to the vanilla approach.

Keep in mind that the best approach depends on your specific use case, project requirements, and performance considerations.

Related benchmarks:

Test selectors (version: 0)

Comparing performance of: Directly vs Via attr

Created: 5 years ago by: Guest

Jump to the latest result

Directly

Via attr

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):