Benchmark: dataset access - MeasureThat.net

HTML Preparation code:

<h3 id="data" data-test="text">kipr202 header</h3>

Tests:

as Object
window.onload = function() { document.querySelector("h3#data").dataset.test; }
as Array
window.onload = function() { document.querySelector("h3#data").dataset['test']; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
as Object
as Array

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Overview**

The benchmark is designed to measure the performance of two different ways of accessing the `dataset.test` property on an HTML element. The test case uses JavaScript, specifically the `window.onload` event to execute a script that accesses this property.

**Options Compared**

There are two options being compared:

1. **Object notation**: `document.querySelector("h3#data").dataset.test`
2. **Array notation**: `document.querySelector("h3#data").dataset['test']`

**Pros and Cons**

* **Object notation**:
	+ Pros: More readable and intuitive, as it follows the conventional property access syntax.
	+ Cons: May be slower due to string lookup (in modern JavaScript engines like V8, this is not a significant performance hit).
* **Array notation**:
	+ Pros: Can be faster for certain use cases, such as when using older browsers or environments with strict string literals.
	+ Cons: Less readable and may require more effort from developers to understand the intent behind the code.

In modern JavaScript engines like V8, the difference in performance between these two approaches is minimal. However, some older browsers or environments might benefit from the array notation due to differences in how they handle property access.

**Library and Purpose**

There is no explicit library mentioned in this benchmark. The `dataset` property is a built-in feature of HTML5 that allows JavaScript to access arbitrary data attributes on an element.

**Special JS Feature or Syntax**

The benchmark uses the modern syntax for accessing the `dataset` property, which was introduced in HTML5 and supported by most browsers since version 4. Additionally, it uses template literals (the `r\n` syntax) to create a multi-line string, which is also a relatively new feature.

**Other Considerations**

This benchmark only tests the performance difference between two specific approaches to accessing a property on an element. In a more comprehensive benchmarking suite, you might want to consider other factors, such as:

* The type of data being stored in the `dataset` property.
* The frequency and volume of access to this property.
* The size and complexity of the HTML document being processed.

**Alternatives**

Other alternatives for measuring performance differences between accessing properties on elements include:

1. Measuring the time it takes to update an element's text content using different methods (e.g., `innerHTML`, `textContent`, or a custom setter).
2. Comparing the performance of different ways to manipulate an element's style attributes.
3. Using a benchmarking library like Benchmark.js, which provides a set of pre-built benchmarks for common JavaScript scenarios.

In general, when building a comprehensive benchmarking suite, it's essential to consider multiple factors and edge cases to ensure that your tests accurately represent real-world usage patterns.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.118 Whale/2.11.126.23 Safari/537.36

Browser/OS: Chrome 94 on Windows

View result in a separate tab

Test name	Executions per second
as Object	1069671.1 Ops/sec
as Array	959222.9 Ops/sec

Related benchmarks:

dataset access (version: 0)

Comparing performance of: as Object vs as Array

Created: 2 years ago by: Registered User

Jump to the latest result

as Object

as Array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):