Benchmark: jQuery getting element by class vs document

HTML Preparation code:

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script>
<div id="testElement" class="testClass"></div>
<div id="testElement2" class="testClass"></div>

<div id="testElement3" class="testDocument"></div>
<div id="testElement4" class="testDocument"></div>

Script Preparation code:

$( document ).ready(function() {
    $( document ).on( "click", "testDocument", function() {
        console.log( "click testDocument" );
    });
  
  $( ".testClass" ).on( "click",function() {
        console.log( "click testClass" );
    });
})

Tests:

jQuery document
$( document ).ready(function() { $( ".testDocument" ).trigger("click"); })
jQuery class
$( document ).ready(function() { $( ".testClass" ).trigger("click"); })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
jQuery document
jQuery class

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 break down the provided JSON and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**

The benchmark compares the speed of two approaches to get an HTML element:

1. `document.querySelector` (not explicitly mentioned in the JSON, but inferred from the test cases)
2. jQuery's `.class()` method

**Options Compared**

Two options are compared:

* **jQuery Document**: This approach uses jQuery's `.document()` method and then calls `.querySelector` on it to get an element.
* **jQuery Class**: This approach uses jQuery's `.class()` method (note: this is not a standard method in jQuery, but rather a custom implementation) to get an element.

**Pros and Cons of Each Approach**

1. **jQuery Document**:
	* Pros:
		+ Works with both DOM elements and pseudo-elements.
		+ Supports older versions of jQuery that may not have the `.class()` method.
	* Cons:
		+ Can be slower due to the extra method call and potential DOM traversal.
2. **jQuery Class**:
	* Pros:
		+ May be faster for specific use cases where `document.querySelector` is used with a class selector.
	* Cons:
		+ Not a standard jQuery method, so it may not work in all environments or versions of jQuery.

**Library**

In both test cases, the library being used is jQuery. The `.class()` method is a custom implementation and not part of the standard jQuery API.

**Special JS Feature/Syntax**

There's no special JavaScript feature or syntax mentioned in this benchmark. It's a straightforward comparison of two methods to get an HTML element.

**Other Alternatives**

If you wanted to implement this benchmark yourself, here are some alternatives:

* Use `document.querySelector` directly: This is the standard method for getting an element by its class.
* Implement a custom `.class()` method using a similar approach as jQuery's implementation.
* Compare other methods, such as:
	+ Vanilla JavaScript `document.getElementsByClassName` vs. jQuery's `.class()`
	+ Modern JavaScript approaches like `useCallback` or `useMemo`

Keep in mind that this benchmark is specific to getting an element by its class, so you may want to create a similar benchmark for different scenarios.

Related benchmarks:

jQuery getting element by class vs document (version: 0)

Comparing speed of getting element by class adn document with jQuery

Comparing performance of: jQuery document vs jQuery class

Created: 3 years ago by: Registered User

Jump to the latest result

jQuery document

jQuery class

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):