Benchmark: jQuery hasClass vs jQuery classList.contains123123

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div id="el" class="test"></div>

Tests:

jQuery hasClass
$("#el").hasClass("test");
jQuery is
$("#el").is(".test");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
jQuery hasClass
jQuery is

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36

Browser/OS: Chrome 87 on Mac OS X 11.0.1

View result in a separate tab

Test name	Executions per second
jQuery hasClass	796025.5 Ops/sec
jQuery is	411007.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark definition consists of two test cases: `jQuery hasClass` and `jQuery is`. These test cases compare two ways to check if an element has a specific class using jQuery.

**Options Compared**

1. `hasClass()`: This method checks if the element has a specific class by searching for the class name in the element's DOM.
2. `is()` with a selector: This method uses a selector (in this case, `.test`) to check if the element matches a specific CSS rule.

**Pros and Cons**

1. **hasClass()**:
	* Pros:
		+ Fast performance, as it only searches for the class name in the DOM.
		+ Can be more reliable, as it doesn't rely on CSS rules.
	* Cons:
		+ May return false positives if there are other elements with the same class name.
2. `is()` with a selector:
	* Pros:
		+ More readable and maintainable, as it uses a clear and concise syntax.
		+ Can be more efficient, as it only checks for the specific CSS rule.
	* Cons:
		+ May have performance issues if the CSS rule is complex or not cached well.
		+ May return false positives if there are other elements with the same CSS class.

**Library and Purpose**

In this benchmark, jQuery is used. The `hasClass()` method uses the `selector` option to search for classes in the DOM, while the `is()` method uses a selector to match the specific CSS rule.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. However, it's worth noting that the use of `$(document).ready()` is implied, as jQuery's DOM manipulation methods (such as `removeClass()`, `addClass()`, and `hasClass()`) require the document to be ready.

**Other Alternatives**

If you were to rewrite these test cases without using jQuery, you could use other JavaScript libraries or frameworks that provide similar functionality. Some alternatives include:

* Vanilla JavaScript: You can use the `Element.classList` property to check if an element has a specific class.
* Lodash: This library provides a `className()` function that returns a string containing all classes of the given element.
* Other CSS libraries (e.g., `css-select`: this library allows you to select elements based on their CSS classes).

Keep in mind that these alternatives may not provide the same level of performance or readability as jQuery's methods.

**Benchmark Preparation Code**

The preparation code is quite simple:

```javascript
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div id="el" class="test"></div>
```

This code includes the jQuery library and sets up a basic HTML structure with an element `#el` that has a class `test`.

**Individual Test Cases**

The two test cases are:

```javascript
// Test 1: jQuery hasClass
$("#el").hasClass("test");

// Test 2: jQuery is
$("#el").is(".test");
```

These tests use jQuery's `hasClass()` and `is()` methods to check if the element `#el` has a class `test`.

Related benchmarks:

jQuery hasClass vs jQuery classList.contains123123 (version: 0)

Comparing performance of: jQuery hasClass vs jQuery is

Created: 4 years ago by: Guest

Jump to the latest result

jQuery hasClass

jQuery is

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):