Benchmark: className vs. setAttribute vs. classList (multiple classes)

HTML Preparation code:

<div id="foo"></div>

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = "bar lamp"; }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", "bar lamp"); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); element.classList.add("lamp"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
className
setAttribute
classList

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 its components.

**Benchmark Definition**

The benchmark measures the performance of three different approaches to add multiple classes to an HTML element:

1. `className` (using the `=` operator)
2. `setAttribute` (using the `setAttribute` method)
3. `classList` (using the `classList.add` method)

**Options Compared**

These three options are compared because they may have different performance characteristics due to various factors such as parsing, DOM manipulation, and browser implementation.

**Pros and Cons of Each Approach:**

1. **className**:
	* Pros: Simple and intuitive, no need for additional libraries or methods.
	* Cons: May require additional parsing by the browser, potentially leading to slower performance.
2. **setAttribute**:
	* Pros: Can be faster than `className` since it only sets a single attribute value.
	* Cons: Requires calling an additional method (`setAttribute`), which might introduce overhead.
3. **classList**:
	* Pros: More modern and efficient, as it leverages the browser's built-in class list management.
	* Cons: May require support for the `classList` API in older browsers.

**Library and Its Purpose**

None of the options explicitly use a library or framework in this benchmark.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in these benchmarks, such as async/await, promises, or destructuring.

**Other Alternatives**

If you were to compare alternative approaches, some possibilities could include:

* Using `style` attribute instead of `className`
* Using a library like jQuery for DOM manipulation
* Using a framework like React or Angular for component management

However, these alternatives are not explicitly mentioned in the benchmark.

Overall, this benchmark provides a straightforward comparison of three common methods for adding multiple classes to an HTML element, making it easy to understand and reproduce the results.

Related benchmarks:

className vs. setAttribute vs. classList (multiple classes) (version: 0)

Comparing performance of: className vs setAttribute vs classList

Created: 4 years ago by: Guest

Jump to the latest result

className

setAttribute

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):