Benchmark: JQuery: find by id vs find by id and tag

HTML Preparation code:

<div id="test1">1</div>
<div id="test2">2</div>
<div id="test3">3</div>
<div id="test4">4</div>
<div id="test5">5</div>
<div id="test6">6</div>
<div id="test7">7</div>
<div id="test8">8</div>
<div id="test9">9</div>
<div id="test10">10</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.js'></script>

Tests:

find by id
$("#test5");
find by id and tag
$("div#test5");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find by id
find by id and tag

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 break down the provided JSON benchmark definition.

**Benchmark Definition**

The benchmark is comparing two different ways to use jQuery to select elements in HTML. Specifically, it's testing:

1. `$("#test5");` - finding an element by its ID using the `#` symbol (also known as " IDs" or "class selectors").
2. `$("div#test5");` - finding an element by its ID and tag name (`div`) using both the `#` symbol and a space.

**Options Compared**

The two options being compared are:

* Using jQuery's `.find()` method to find elements by ID, followed by another selector (in this case, no additional selector).
* Using jQuery's `.find()` method twice: once with an ID selector (`div#test5`) and again with a tag name selector (`div`).

**Pros and Cons**

1. **Using `$("#test5");`**:
	* Pros: faster execution time since it doesn't require two separate lookups.
	* Cons: only finds elements with the exact specified ID; no additional filtering or searching for matching elements.
2. **Using `$("div#test5");`**:
	* Pros: can find elements that match both the ID and tag name, making it more inclusive.
	* Cons: potentially slower execution time since it requires two lookups.

**Library**

The benchmark uses jQuery (a popular JavaScript library for DOM manipulation) to perform the selects. jQuery's `.find()` method is used to search for elements within a set of matched elements.

**Special JS Feature/Syntax**

This benchmark doesn't use any special JavaScript features or syntax, such as async/await, ES6 classes, or destructuring.

**Other Alternatives**

If you wanted to run this benchmark on other browsers or environments, you could modify the `Html Preparation Code` and `Script Preparation Code` fields in the Benchmark Definition JSON. For example:

* To compare with Chrome, you might change the script source URL to point to a Chrome-specific jQuery version.
* To test performance with multiple browser versions or on mobile devices, you'd need to update the `Browser` and `DevicePlatform` fields.

Keep in mind that running benchmarks requires careful consideration of how your code will behave across different environments and browsers.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0

Browser/OS: Firefox 78 on Windows

View result in a separate tab

Test name	Executions per second
find by id	2213615.5 Ops/sec
find by id and tag	136610.2 Ops/sec

Related benchmarks:

JQuery: find by id vs find by id and tag (version: 0)

compare find dive element using JQuery

Comparing performance of: find by id vs find by id and tag

Created: 4 years ago by: Guest

Jump to the latest result

find by id

find by id and tag

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):