Benchmark: Data attribute access

HTML Preparation code:

<div id='xd' data-name="xD"></div>

Script Preparation code:

var e = (() => {
	const state = {
    	name: 'xD'
    }
    
    const el = document.getElementById('xd')
    el.get_name = () => state.name
    return el
})()

Tests:

by data attribute
const name = e.dataset.name
by function
const name = e.get_name()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
by data attribute
by function

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 dive into the explanation of the provided JavaScript microbenchmark.

**What is being tested?**

The benchmark measures the performance difference between two approaches to access a value stored in a HTML element: by using a data attribute (via `dataset`) and by accessing a custom function that returns the same value.

**Options compared**

Two options are being compared:

1. **By Data Attribute**: This approach uses the `dataset` property of an HTML element to access the value stored in the `data-name` attribute.
2. **By Function**: This approach accesses the value through a custom function `get_name()` that is defined on the same HTML element.

**Pros and Cons**

* **By Data Attribute**:
	+ Pros: Simple, easy to implement, and widely supported by modern browsers.
	+ Cons: May not be as efficient due to the need to access an attribute, which can lead to additional overhead.
* **By Function**:
	+ Pros: Can be more efficient since it avoids accessing an attribute, reducing overhead.
	+ Cons: Requires defining a custom function on the element, which can add complexity.

**Other considerations**

The benchmark also considers the impact of using `const` to declare variables and the use of arrow functions (as seen in the script preparation code).

**Library used (if applicable)**

None is explicitly mentioned in the provided benchmark definition. However, it's worth noting that some browsers may have optimized their internal data structures or caching mechanisms for elements with a specific attribute, such as `data-` attributes.

**Special JS feature or syntax**

This benchmark does not use any special JavaScript features or syntax beyond what is typically available in modern browsers. It relies on standard HTML attributes and basic JavaScript functionality.

**Alternatives**

There are other approaches to access values stored in HTML elements:

* Using `getAttribute()` and `setAttribute()`: This method is more verbose but allows for more control over the attribute's value.
* Using `requestAnimationFrame()` or `setTimeout()`: These methods can be used to defer execution of code until a specific time, potentially improving performance by avoiding unnecessary computations.

Keep in mind that these alternatives might not provide significant performance benefits in this particular benchmark and may introduce additional complexity.

Related benchmarks:

Data attribute access (version: 0)

Comparing performance of: by data attribute vs by function

Created: 3 years ago by: Guest

Jump to the latest result

by data attribute

by function

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):