Benchmark: classList vs style..

HTML Preparation code:

<div id="foo1" class="foo1"></div>
<div id="foo2" class="foo2"></div>

Tests:

classList
var element1 = document.getElementById("foo1"); var element2 = document.getElementById("foo2"); var i = 1000; while (i--) { element1.classList.remove("foo1"); element1.classList.add("bar1"); element2.classList.remove("foo1"); element2.classList.add("bar2"); }
style
var element1 = document.getElementById("foo1"); var element2 = document.getElementById("foo2"); var i = 1000; while (i--) { element1.style.background = '#000000'; element1.style.borderColor = '#000000'; element1.style.color = '#000000'; element1.style.opacity = 0.5; element2.style.background = '#000000'; element2.style.borderColor = '#000000'; element2.style.color = '#000000'; element2.style.opacity = 0.5; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
classList
style

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.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark, specifically measuring the performance of two approaches: using CSS classes (`classList`) versus setting styles directly on HTML elements (`style`). The benchmark is designed to simulate 1000 iterations of adding and removing classes from two identical HTML elements.

**Options Compared**

Two options are compared:

1. **classList**: This approach uses the `classList` property, which allows for easier manipulation of CSS classes on an element.
2. **style**: This approach sets styles directly on the HTML element using the `style` attribute.

**Pros and Cons of Each Approach**

**classList**

Pros:

* More concise and readable code
* Easier to maintain and modify class definitions
* Less prone to typos or invalid class names

Cons:

* May be slower due to additional overhead for class manipulation (e.g., adding/removing classes, checking if a class exists)
* Requires a CSS class definition to be present on the element (if not defined, `classList` is an empty set)

**style**

Pros:

* Can directly modify styles without needing additional class definitions
* May be faster due to reduced overhead for class manipulation

Cons:

* Less readable and maintainable code
* Prone to typos or invalid style values
* Requires setting the style attribute on each element individually (more verbose)

**Library Used: `classList`**

The `classList` property is a part of the DOM (Document Object Model) API in modern browsers, allowing for easier manipulation of CSS classes. It provides methods like `add()`, `remove()`, and `contains()` to manage class sets.

**Special JS Feature/Syntax**

None mentioned in this benchmark.

**Other Alternatives**

Alternative approaches could include:

1. **Using a library or framework**: Depending on the specific use case, other libraries or frameworks (e.g., React, Angular) might provide optimized solutions for class manipulation and styling.
2. **Custom implementation using CSS**: Instead of using `classList` or setting styles directly, developers might implement their own solution using CSS rules, such as adding and removing classes via CSS media queries.

Keep in mind that these alternatives may not be relevant to this specific benchmark, which focuses on comparing the performance of `classList` vs. `style`.

Related benchmarks:

classList vs style.. (version: 3)

Comparing performance of: classList vs style

Created: 5 years ago by: Registered User

Jump to the latest result

classList

style

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):