Benchmark: direct style vs. setAttribute vs. classList

HTML Preparation code:

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

Tests:

direct style
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.style.postiion = "fixed"; }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", "bar"); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
direct style
setAttribute
classList

Fastest: N/A

Slowest: N/A

Latest 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.

**What is being tested?**

The benchmark tests three different ways to set the `position` property of an HTML element in JavaScript:

1. **Direct style**: Using the `style` property directly on the element.
2. **setAttribute**: Setting an attribute on the element using the `setAttribute` method.
3. **classList**: Using the `classList` API to add a class with the desired value.

**What options are being compared?**

The three options are being compared in terms of their performance, specifically how many executions per second (ExecutionsPerSecond) they produce.

**Pros and Cons:**

1. **Direct style**:
	* Pros: Simple and straightforward, no additional overhead.
	* Cons: May be slower due to the number of DOM operations required.
2. **setAttribute**:
	* Pros: Can be faster than direct style since it only sets a single attribute.
	* Cons: Requires an extra method call and may incur additional overhead.
3. **classList**:
	* Pros: Efficient and fast, as it only adds a class to the element's class list.
	* Cons: May require additional library or framework support.

**Library/ Framework Consideration**

The `classList` API is a modern JavaScript feature that provides an efficient way to work with classes on HTML elements. It's supported by most modern browsers and frameworks, making it a good choice for performance-critical applications.

**Special JS Feature/Syntax**

None of the benchmarked code uses special JavaScript features or syntax beyond standard ES6+ syntax.

**Other Alternatives**

For setting the `position` property directly on an element:

* Using the `style.position` property with the `inline-style` CSS rule (although this is less efficient than direct style)
* Using a library like jQuery to set the position property

These alternatives may incur additional overhead or require more complex setup, making them less suitable for performance-critical applications.

**Benchmark Preparation Code**

The provided HTML preparation code `<div id="foo"></div>` creates an empty `div` element with the ID "foo", which is used as a target for the benchmarking tests.

For the script preparation code, each test case is identical and only sets up the initial conditions for the test:
```javascript
var element = document.getElementById("foo");
var i = 1000;
while (i--) {
  // The actual code being tested is inside this loop
}
```
This code creates a reference to the `div` element with ID "foo" and initializes a counter variable `i`. The test then runs in a loop, executing the code inside it repeatedly.

Related benchmarks:

direct style vs. setAttribute vs. classList (version: 0)

Comparing performance of: direct style vs setAttribute vs classList

Created: 7 years ago by: Guest

Jump to the latest result

direct style

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):