Benchmark: Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (Jquery 3.3.1)

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul id="theList">
  <li class="odd">Item 1</li>    
  <li class="even">Item 2</li>    
  <li class="odd">Item 3</li>    
  <li class="even">Item 4</li>    
  <li class="odd">Item 5</li>    
  <li class="even">Item 6</li>    
  <li class="odd">Item 7</li>    
  <li class="even">Item 8</li>    
  <li class="odd">Item 9</li>    
  <li class="even">Item 10</li>    
  <li class="odd">Item 11</li>    
  <li class="even">Item 12</li>    
  <li class="odd">Item 13</li>    
  <li class="even">Item 14</li>    
  <li class="odd">Item 15</li>    
  <li class="even">Item 16</li>    
  <li class="odd">Item 17</li>    
  <li class="even">Item 18</li>    
  <li class="odd">Item 19</li>    
  <li class="even">Item 20</li>    
  <li class="odd">Item 21</li>    
  <li class="even">Item 22</li>    
  <li class="odd">Item 23</li>    
  <li class="even">Item 24</li>    
  <li class="odd">Item 25</li>    
  <li class="even">Item 26</li>    
  <li class="odd">Item 27</li>    
  <li class="even">Item 28</li>    
  <li class="odd">Item 29</li>    
  <li class="even">Item 30</li>    
</ul>

Tests:

jQuery
var els = $('.even');
querySelectorAll
var els = document.querySelectorAll('.even');
getElementsByClassName
var els = document.getElementsByClassName('even');
jQuery: mixed selector
var els = $('li.even');
querySelectorAll: mixed selector
var els = document.querySelectorAll('li.even');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
jQuery
querySelectorAll
getElementsByClassName
jQuery: mixed selector
querySelectorAll: mixed selector

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 23 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the provided benchmark definitions and analyze what is being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The first benchmark definition json represents the overall benchmark that compares various methods of obtaining a group of elements identified by class name. This includes:

* `Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (Jquery 3.3.1)`
* The script preparation code is null, indicating that no specific JavaScript code needs to be executed before running the benchmark.
* The HTML preparation code includes a link to jQuery 3.3.1 and an unordered list (`<ul>`) with elements having classes like `even`, `odd`, etc.

**Individual Test Cases**

The individual test cases represent four separate benchmarks that compare different methods of obtaining elements by class name:

* `jQuery`
	+ Benchmark definition: `var els = $('.even');` (uses jQuery's `$.()` method)
	+ Purpose: Test the performance of using jQuery's `$()` method to select elements by class name.
* `querySelectorAll`
	+ Benchmark definition: `var els = document.querySelectorAll('.even');` (uses the `document.querySelectorAll()` method)
	+ Purpose: Test the performance of using the `document.querySelectorAll()` method to select elements by class name.
* `getElementsByClassName`
	+ Benchmark definition: `var els = document.getElementsByClassName('even');` (uses the `document.getElementsByClassName()` method)
	+ Purpose: Test the performance of using the `document.getElementsByClassName()` method to select elements by class name.
* `jQuery: mixed selector`
	+ Benchmark definition: `var els = $('li.even');` (uses jQuery's `$()` method with a mixed selector)
	+ Purpose: Test the performance of using jQuery's `$()` method with a mixed selector to select elements by class name.

**Options Compared**

The four benchmark cases compare the following options:

* jQuery's `$()` method
* The `document.querySelectorAll()` method
* The `document.getElementsByClassName()` method

**Pros and Cons**

Here are some pros and cons of each option:

* **jQuery's `$()` method**
	+ Pros: Easy to use, efficient, and widely supported.
	+ Cons: Can be slower than native methods for simple selections, may require additional library dependencies.
* **`document.querySelectorAll()` method**
	+ Pros: Native implementation, fast, and supports complex selectors.
	+ Cons: May not support older browsers or have inconsistent behavior across different versions.
* **`document.getElementsByClassName()` method**
	+ Pros: Fast, widely supported, and easy to use for simple selections.
	+ Cons: Limited support for CSS selectors, may return a NodeList instead of an HTMLCollection.

**Other Considerations**

When choosing a method for selecting elements by class name, consider the following factors:

* Performance: Native methods like `document.querySelectorAll()` and `document.getElementsByClassName()` are generally faster than jQuery's `$()` method.
* Browser Support: If you need to support older browsers, you may want to use native methods or jQuery's `$()` method.
* Complexity of Selections: For simple selections, the `$()` method may be sufficient. However, for more complex selections, `document.querySelectorAll()` is a better choice.

In conclusion, this benchmark comparison helps us understand the performance characteristics of different methods for selecting elements by class name. By considering factors like performance, browser support, and complexity of selections, you can choose the best approach for your specific use case.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; 6201) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Mobile Safari/537.36 OPR/64.2.3282.60128

Browser/OS: Opera Mobile 64 on Android

View result in a separate tab

Test name	Executions per second
jQuery	32441.8 Ops/sec
querySelectorAll	101026.6 Ops/sec
getElementsByClassName	441462.1 Ops/sec
jQuery: mixed selector	24694.3 Ops/sec
querySelectorAll: mixed selector	76593.2 Ops/sec

Related benchmarks:

Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (Jquery 3.3.1) (version: 0)

Compare various methods of obtaining a group of elements identified by class name

Comparing performance of: jQuery vs querySelectorAll vs getElementsByClassName vs jQuery: mixed selector vs querySelectorAll: mixed selector

Created: 3 years ago by: Registered User

Jump to the latest result

jQuery

querySelectorAll

getElementsByClassName

jQuery: mixed selector

querySelectorAll: mixed selector

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 23 days ago):