Benchmark: External eq() vs Internal

HTML Preparation code:

<div id="test">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>

Tests:

Internal eq()
jQuery('#test').find('item:eq(1)');
External eq()
jQuery('#test').find('item').eq(1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Internal eq()
External eq()

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**What is tested?**

The provided JSON represents two test cases, each testing the performance difference between using an external `eq()` selector (inside jQuery's `find()` method) versus an internal `eq()` method (inside jQuery's `find()` method with an additional index).

In other words, these tests are comparing:

1. How fast is it to access an element at a specific index when using the external `eq()` selector (`jQuery('#test').find('item:eq(1)')`)? vs
2. How fast is it to access an element at a specific index when using the internal `eq()` method (`jQuery('#test').find('item').eq(1)`)?

**Options compared:**

The two test cases compare the following options:

1. External `eq()` selector (inside jQuery's `find()` method): `jQuery('#test').find('item:eq(1)')`
2. Internal `eq()` method (inside jQuery's `find()` method with an additional index): `jQuery('#test').find('item').eq(1)`

**Pros and Cons:**

1. **External `eq()` selector:**
	* Pros:
		+ May be faster because the browser can use the DOM's indexing mechanism, which is optimized for performance.
		+ Less memory usage since it doesn't create an intermediate array of elements.
	* Cons:
		+ Requires jQuery to perform additional work (finding the element and then accessing its index).
2. **Internal `eq()` method:**
	* Pros:
		+ Faster because it eliminates the need for jQuery to find the element using `find()`.
		+ More memory efficient since it creates an intermediate array of elements.
	* Cons:
		+ May be slower due to the additional indexing step, which can lead to slower performance.

**Library and purpose:**

The library used in this benchmark is jQuery (version 3.1.0). jQuery's `find()` method is a powerful tool for selecting elements in the DOM tree.

In both test cases, the library is used to:

1. Select the HTML element with the ID "test" using `jQuery('#test')`.
2. Use either the external `eq()` selector or internal `eq()` method to access the second element within the selected container (`#test`).

**Special JS feature:**

None of the test cases use any special JavaScript features, such as ES6 syntax, async/await, or modern browser-specific APIs.

**Other alternatives:**

If you want to explore more performance-related benchmarks, here are a few alternative options:

1. **Vanilla DOM manipulation**: Compare the performance of using only native JavaScript (no library) for DOM manipulation.
2. **ES6/ES7 features**: Test the performance of different ES6 and ES7 features, such as arrow functions, classes, or async/await.
3. **Browser-specific APIs**: Explore the performance differences between browser-specific APIs, like WebStorage or WebAudio.

Keep in mind that these alternative benchmarks might require significant changes to the test code and setup.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.122 Safari/537.36 Vivaldi/1.4.589.29

Browser/OS: Chrome 53 on Windows 7

View result in a separate tab

Test name	Executions per second
Internal eq()	37832.3 Ops/sec
External eq()	84157.5 Ops/sec

Related benchmarks:

External eq() vs Internal (version: 0)

Testing performance if the eq() selector in JS

Comparing performance of: Internal eq() vs External eq()

Created: 8 years ago by: Guest

Jump to the latest result

Internal eq()

External eq()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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