Benchmark: jquery vs queryselectorAll vs getElementsByTagName 2

HTML Preparation code:

<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script>
<div id="testElement1" class="test class list classes"></div>
<div id="testElement2" class="test classA list classes"></div>
<div id="testElement3" class="test classA list classes"></div>

Tests:

jquery
let divs = $('div.classA')
querySelectorAll
let divs = document.querySelectorAll('div.classA')
getElementsByTagName
let foundDivs = document.getElementsByTagName('div'); let results = []; for(let x = 0; x < foundDivs.length; x++) { let div = foundDivs[x]; if(div.classList.contains('classA')) { results.push(div); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
jquery
querySelectorAll
getElementsByTagName

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser/OS: Chrome 93 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
jquery	755128.3 Ops/sec
querySelectorAll	1502281.6 Ops/sec
getElementsByTagName	4602002.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on MeasureThat.net, comparing the performance of three different approaches for selecting elements with a specific class:

1. jQuery's `$` function
2. `document.querySelectorAll()` method
3. `document.getElementsByTagName()` method followed by a custom filtering loop

**Approaches Compared**

Each approach has its pros and cons:

* **jQuery's `$` function**: Pros:
	+ Widespread adoption and support for various browsers.
	+ Easy to use and intuitive syntax.
	+ Can be used for more complex DOM manipulations beyond just selecting elements by class.
* Cons:
	+ Requires including a jQuery library, which can add overhead in terms of size and execution time.
	+ May not perform as well on older browsers or those with limited JavaScript capabilities.
* **`document.querySelectorAll()` method**: Pros:
	+ Lightweight and fast compared to jQuery's `$` function.
	+ Can be used for more complex selectors beyond just class names.
	+ Does not require including an external library.
* Cons:
	+ May require additional setup and configuration for certain browsers or use cases.
	+ Returns all matching elements, which can be less efficient than filtering individual results.
* **`document.getElementsByTagName()` method followed by a custom filtering loop**: Pros:
	+ No external libraries are required.
	+ Can be used with any JavaScript engine that supports `getElementsByTagName()`.
* Cons:
	+ Requires manual iteration and filtering of individual element results.
	+ Can be slower and less efficient than the other two approaches.

**Library: jQuery**

jQuery is a popular JavaScript library that simplifies DOM manipulation and event handling. Its `$` function provides an easy-to-use way to select elements by class, among other selectors. The library includes various methods for selecting elements, manipulating the DOM, and responding to events.

In this benchmark, jQuery's `$` function is used in its simplest form to select all `<div>` elements with the class `classA`.

**Special JS Feature/Syntax**

None mentioned.

**Benchmark Preparation Code**

The provided HTML preparation code includes a basic structure with three `<div>` elements: `<div id="testElement1" class="test class list classes"></div>`, `<div id="testElement2" class="test classA list classes"></div>`, and `<div id="testElement3" class="test classA list classes"></div>`. These elements are used to test the performance of each approach.

**Alternatives**

Other approaches for selecting elements by class include:

* Using `document.getElementsByClassName()` instead of `document.querySelectorAll()`
* Using a library like Sizzle or CSS Selector (a JavaScript port of jQuery's selector engine)
* Implementing custom DOM traversal and filtering logic

Keep in mind that the performance differences between these approaches may vary depending on the specific use case, browser, and JavaScript engine.

Related benchmarks:

jquery vs queryselectorAll vs getElementsByTagName 2 (version: 1)

Comparing performance of: jquery vs querySelectorAll vs getElementsByTagName

Created: 3 years ago by: Registered User

Jump to the latest result

jquery

querySelectorAll

getElementsByTagName

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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