Benchmark: classlist vs style

HTML Preparation code:

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

Tests:

classlist
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); }
style
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.style.display = 'none'; }

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

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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 what's being tested in the provided benchmark.

**Benchmark Definition**

The benchmark is defined by the JSON object:

```
{
  "Name": "classlist vs style",
  "Description": null,
  "Script Preparation Code": null,
  "Html Preparation Code": "<div id=\"foo\"></div>"
}
```

In this case, there are no script preparation codes provided, but we have an HTML code that defines a single element with the ID `foo`.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **classlist**
```javascript
var element = document.getElementById("foo");
var i = 1000;
while (i--) {
  element.classList.add("bar");
}
```

This test case adds the class `"bar"` to the `element` using its `classList` property.

2. **style**
```javascript
var element = document.getElementById("foo");
var i = 1000;
while (i--) {
  element.style.display = 'none';
}
```

This test case sets the display style of the `element` to `'none'`.

**What's being compared?**

The two test cases are comparing the performance of adding a class to an element using its `classList` property versus setting the display style to `'none'` directly.

**Options Compared**

The options being compared are:

* Using `classList.add()` to add a class to an element
* Using `style.display = 'none'` to set the display style of an element

**Pros and Cons**

1. **Using `classList.add()`**
	* Pros:
		+ Easier to read and maintain code, as it separates concerns between adding classes and manipulating styles.
		+ More explicit and intentional action (adding a class).
	* Cons:
		+ May incur additional overhead due to the separate step of adding a class.
2. **Using `style.display = 'none'`**
	* Pros:
		+ Can be faster, as it directly manipulates the style attribute.
	* Cons:
		+ Less explicit and less maintainable code, as it mixes concerns between styles and display manipulation.

**Library/Functionality**

In this benchmark, there is no specific library or functionality being used. However, using `classList` is a feature introduced in ECMAScript 2015 (ES6), which allows for more expressive and efficient class management.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested here. The tests are focused on comparing two specific approaches to styling and manipulating elements.

**Other Alternatives**

If you were to implement this benchmark, you could also consider testing other approaches, such as:

* Using `style.cssText` to set the display style
* Using a separate CSS rule to toggle display
* Using an animation library or framework

However, these alternatives would likely have similar performance characteristics and are not typically used in everyday web development.

Related benchmarks:

classlist vs style (version: 0)

Comparing performance of: classlist vs style

Created: 4 years ago by: Guest

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):