Benchmark: className vs. classList replace2

HTML Preparation code:

<div id="foo" class="fa-stack tab-selector-badge text-color-colorInfo tooltips"></div>

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = element.className.replace(/[\W]?text-color-color[\w]*/, ""); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { for(var j = 0; j < element.classList.length; j++){ var className = element.classList[j]; if (className.startsWith('text-color-color')) { element.classList.remove(className); } } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
className
classList

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 benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing two approaches to remove a class from an HTML element:

1. Using `className` property with a regular expression (`/[\\W]?text-color-color[\\w]*/`) in a loop.
2. Using the `classList` property with a loop to iterate over each class and check if it starts with 'text-color-color'. If it does, remove the class.

**Options Compared**

The two options are compared in terms of their performance, which is measured by the number of executions per second (`ExecutionsPerSecond`). The benchmark aims to determine which approach is faster.

**Pros and Cons**

1. **Using `className` property with regular expression**
	* Pros:
		+ Simple and concise code.
		+ Works well for small to medium-sized class names.
	* Cons:
		+ Performance can degrade if the class name is long or contains many special characters, which slows down the loop.
		+ Regular expressions can be overkill for simple class removal tasks.
2. **Using `classList` property**
	* Pros:
		+ More efficient than using regular expressions, especially for larger class names.
		+ Avoids potential issues with character encoding and special characters.
	* Cons:
		+ Requires support for the `classList` property, which might not be available in older browsers.
		+ Can be slower if the number of classes is large, since it needs to iterate over each one.

**Library Used**

None. This benchmark only uses built-in JavaScript features and no external libraries.

**Special JS Feature or Syntax**

The benchmark doesn't use any special JavaScript features or syntax beyond regular expressions.

**Other Considerations**

When writing similar code in your own projects:

* Use the `classList` property whenever possible, as it's generally faster and more efficient.
* Be cautious when using regular expressions for class removal, especially if dealing with large or complex class names. Consider alternative approaches, like using a library or implementing a custom solution.

**Alternatives**

If you're not comfortable using the `classList` property, you can use other alternatives to remove classes, such as:

1. `element.getAttribute('class')` and `element.setAttribute('class', element.getAttribute('class').replace(/text-color-color/g, ''))`
2. Using a library like jQuery, which provides a more efficient way to manipulate class lists.

Keep in mind that these alternatives might introduce additional overhead or dependencies, so consider the trade-offs when choosing an approach for your specific use case.

Related benchmarks:

className vs. classList replace2 (version: 0)

Comparing performance of: className vs classList

Created: 3 years ago by: Guest

Jump to the latest result

className

classList

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):