Benchmark: querySelectorAll data attribute vs class name need

HTML Preparation code:

<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test-need" data-need="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>

Tests:

data attribute
var test = document.querySelectorAll('[data-need]');
class name
var test = document.querySelectorAll('.test-need');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
data attribute
class name

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
data attribute	1850235.9 Ops/sec
class name	3150477.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark definition and results are used to compare the performance of two approaches: using a `data-need` attribute versus using a class name in document query selection.

**Options Compared**

The two options compared are:

1. **Data Attribute Approach**: This approach uses the `querySelectorAll()` method with a CSS selector that targets elements with a `data-need` attribute.
2. **Class Name Approach**: This approach uses the `querySelectorAll()` method with a CSS selector that targets elements with a class name of "test-need".

**Pros and Cons**

**Data Attribute Approach**

Pros:

* More flexible, as attributes can be customized to match specific requirements
* Can be used in conjunction with other selectors

Cons:

* May have performance overhead due to attribute lookup
* Requires additional attribute manipulation (e.g., setting and parsing attributes)

**Class Name Approach**

Pros:

* Generally faster, as class name lookup is more efficient than attribute lookup
* More straightforward to implement and maintain

Cons:

* Less flexible, as class names must be predefined and matched exactly
* May not work correctly if classes are dynamically added or removed

**Library Used: None**

No libraries are explicitly mentioned in the benchmark definition. However, it's worth noting that `querySelectorAll()` is a built-in method of the Document Object Model (DOM), which means no external library is required.

**Special JS Feature/ Syntax: None**

There are no special JavaScript features or syntax used in this benchmark.

**Other Alternatives**

Other approaches to select elements by attribute or class name include:

* `getElementsById()` and `getAttribute()` methods for accessing element attributes
* Regular expressions (RegExp) for matching attribute values
* jQuery's `.attr()` and `.hasClass()` methods for working with classes and attributes

However, these alternatives may have performance implications or require additional libraries, making the `querySelectorAll()` method a more suitable choice for this benchmark.

Related benchmarks:

querySelectorAll data attribute vs class name need (version: 0)

Comparing performance of: data attribute vs class name

Created: 3 years ago by: Guest

Jump to the latest result

data attribute

class name

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):