Benchmark: Test bench - MeasureThat.net

HTML Preparation code:

<div id='elem'><a href="#" class='link'></a> </div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Script Preparation code:

function selByClass(c){
	return document.getElementsByClassName(c);
}

Tests:

TEST 1
let test = $("#elem a"); console.log(test)
TEST 2
let test = $("#elem").find("a"); console.log(test)
TEST 3
let test = document.getElementsByClassName('link'); console.log(test)
Test 4
let test = selByClass('link'); console.log(test)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
TEST 1
TEST 2
TEST 3
Test 4

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.

I'll break down the provided JSON data for MeasureThat.net, which is used to create and run JavaScript microbenchmarks.

**Benchmark Definition**

The benchmark definition provides the framework for measuring the performance of specific JavaScript code snippets. It includes:

1. **Script Preparation Code**: This section contains a custom function called `selByClass(c)`, which returns an array of elements with the specified class using the `getElementsByClass` method. This function is used to prepare the script context.
2. **Html Preparation Code**: This section contains HTML code that defines a single link element (`<a href=\"#\" class='link'>`) within a container div (`<div id='elem'>`). The JavaScript file from jQuery library (v3.3.1) is also included in the HTML.

**Individual Test Cases**

Each test case represents a specific benchmark, with its own script definition and name:

1. **TEST 1**: Uses `document.getElementsByClassName('link')` to retrieve an array of elements with class 'link'.
2. **TEST 2**: Uses `$(`#elem a`)` (a jQuery selector) to select the link element within the container div.
3. **TEST 3**: Similar to TEST 1, uses `document.getElementsByClassName('link')`.
4. **Test 4**: Uses the custom function `selByClass('link')` to retrieve an array of elements with class 'link'.

**Library: jQuery**

In TEST 2 and Test 4, `$(`#elem a`)` is used as a JavaScript selector. The library being used is jQuery (version 3.3.1). jQuery provides a way to select and manipulate HTML elements using CSS selectors.

**Special JS Feature/Syntax:**

None are explicitly mentioned in the provided code snippets.

**Comparison of Options**

The four test cases can be compared based on their approach:

* **TEST 1** and **TEST 3**: Both use `document.getElementsByClassName('link')`, which is a native JavaScript method to retrieve elements by class. This approach is straightforward but may have performance implications due to the browser's DOM manipulation.
* **TEST 2**: Uses `$(`#elem a`)` from jQuery, which provides a more convenient way to select elements using CSS selectors. However, this approach relies on the presence of jQuery in the environment and may add overhead.

**Pros and Cons**

Here are some pros and cons for each approach:

1. **Native JavaScript (TEST 1/3)**:
	* Pros: Fastest execution time, as it only depends on the browser's DOM manipulation.
	* Cons: May be slower due to the browser's engine rendering the DOM elements.
2. **jQuery-based (TEST 2/Test 4)**:
	* Pros: Easier to write and maintain, especially for complex selectors.
	* Cons: Adds overhead from jQuery's library and may be slower than native JavaScript.

**Other Alternatives**

Some other alternatives to measure HTML element selection performance could include:

1. **CSS selectors**: Using only CSS selectors (without JavaScript) to retrieve elements can provide insights into the browser's performance with this approach.
2. **Other DOM manipulation methods**: Comparing different methods for manipulating the DOM, such as `querySelector` or `querySelectorAll`, can help identify the most efficient way to achieve specific tasks.

Keep in mind that these alternatives may not be directly comparable to the provided test cases, and their results might not accurately represent real-world scenarios.

Related benchmarks:

Test bench (version: 4)

test this bench

Comparing performance of: TEST 1 vs TEST 2 vs TEST 3 vs Test 4

Created: 6 years ago by: Registered User

Jump to the latest result

TEST 1

TEST 2

TEST 3

Test 4

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):