Benchmark: test11145 - MeasureThat.net

HTML Preparation code:

<script type="text/javascript" src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<div class="testElement"></div>

Script Preparation code:

function $q(selector, context) {
    return (context || document).querySelectorAll(selector);
}

Tests:

jQuery
var el = $(".testElement")[0]; var className = el.className;
Vanilla JS
var el = document.getElementsByClassName('testElement'); var className = el.className;
Vanilla JS querySelector
var el = document.querySelector('.testElement'); var className = el.className;
VanillaJS custom selector
var el = $q(".testElement"); var className = el.className;
Vanilla JS querySelectorAll
var el = document.querySelectorAll('.testElement'); var className = el.className;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
jQuery
Vanilla JS
Vanilla JS querySelector
VanillaJS custom selector
Vanilla JS querySelectorAll

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

MeasureThat.net provides a platform for users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark that tests the performance of different approaches to retrieve an element by its class name.

**Benchmark Definition JSON**

The benchmark definition JSON contains the following information:

* `Name`: A unique identifier for the benchmark.
* `Description`: A brief description of the benchmark (in this case, "nothing").
* `Script Preparation Code`: A JavaScript function that defines a custom selector `$q` using jQuery's `querySelectorAll` method. This function is used to query elements on the page.
* `Html Preparation Code`: HTML code that loads jQuery 3.4.1 and creates a container element with class `testElement`.

**Individual Test Cases**

The benchmark consists of five test cases, each testing a different approach to retrieve an element by its class name:

1. **jQuery**: Uses jQuery's `$` function to select the first element with class `testElement`.
2. **Vanilla JS**: Uses the `document.getElementsByClassName` method to get an array of elements with class `testElement`. Then, it extracts the class name from the first element.
3. **Vanilla JS querySelector**: Uses the `document.querySelector` method to select the first element with class `testElement`.
4. **VanillaJS custom selector**: Uses the `$q` function defined earlier to query elements on the page.
5. **Vanilla JS querySelectorAll**: Uses the `document.querySelectorAll` method to get an array of elements with class `testElement`. Then, it extracts the class name from the first element.

**Options Compared**

The benchmark compares the performance of five different approaches:

* jQuery (option 1)
* Vanilla JS using `getElementsByClassName` (option 2)
* Vanilla JS using `querySelector` (option 3)
* VanillaJS custom selector (`$q`) (option 4)
* Vanilla JS using `querySelectorAll` (option 5)

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **jQuery**: Fast, but relies on jQuery's DOM manipulation library. May not be suitable for all use cases.
	* Pros: Efficient, reliable
	* Cons: Requires additional library, may not work in older browsers
2. **Vanilla JS (getElementsByClassName)**: Simple and widely supported, but slower than other options.
	* Pros: Lightweight, works in most browsers
	* Cons: Slower than other options, requires extra method call
3. **Vanilla JS (querySelector)**: Fast and efficient, but may not work for all elements or browsers.
	* Pros: Fast, efficient, works well for some use cases
	* Cons: May not work for all elements, browser limitations
4. **VanillaJS custom selector ($q)**: Custom implementation using the `$q` function. May offer better performance than jQuery's `querySelectorAll`.
	* Pros: Optimized for performance, flexible
	* Cons: Requires custom implementation, may not be widely supported
5. **Vanilla JS (querySelectorAll)**: Fast and efficient, but requires extra method call.
	* Pros: Fast, efficient, works well for some use cases
	* Cons: Requires extra method call, slower than `querySelector`

**Other Considerations**

When choosing an approach, consider the following factors:

* Performance: Faster methods like jQuery's `$` or Vanilla JS's `querySelector` may be preferred.
* Browser support: Ensure that the chosen approach works well in older browsers.
* Flexibility: Custom implementations like VanillaJS custom selector may offer more flexibility.
* Weight: Lightweight approaches like Vanilla JS (getElementsByClassName) may be suitable for resource-constrained environments.

**Alternative Approaches**

If you're looking for alternative approaches, consider:

1. **QuerySelector API**: Modern browsers support the QuerySelector API, which offers faster and more efficient methods than `querySelector`.
2. **CSSOM**: The CSS Object Model (CSSOM) provides an efficient way to retrieve elements by class name using the `document.querySelector` method.
3. **Custom implementations**: You can also create custom implementations using JavaScript, like the `$q` function in this benchmark.

I hope this explanation helps you understand the test cases and options compared on MeasureThat.net!

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.116 Safari/537.36

Browser/OS: Chrome 80 on Windows

View result in a separate tab

Test name	Executions per second
jQuery	525549.4 Ops/sec
Vanilla JS	1723073.5 Ops/sec
Vanilla JS querySelector	2182983.2 Ops/sec
VanillaJS custom selector	1011057.6 Ops/sec
Vanilla JS querySelectorAll	1190464.2 Ops/sec

Related benchmarks:

test11145 (version: 0)

nothing

Comparing performance of: jQuery vs Vanilla JS vs Vanilla JS querySelector vs VanillaJS custom selector vs Vanilla JS querySelectorAll

Created: 4 years ago by: Guest

Jump to the latest result

jQuery

Vanilla JS

Vanilla JS querySelector

VanillaJS custom selector

Vanilla JS querySelectorAll

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):