Benchmark: Test find by id - MeasureThat.net

HTML Preparation code:

<div id="parent">
    <div id="child">
        Child
    </div>
</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.js'></script>

Script Preparation code:

var $parent = $("#parent");

Tests:

$("#child")
$("#child");
$parent.find("#child")
$parent.find("#child");
document.getElementById("child")
document.getElementById("child");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
$("#child")
$parent.find("#child")
document.getElementById("child")

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark is designed to compare three approaches for finding an element by its ID using JavaScript: `document.getElementById()`, jQuery's `$()` function, and `find()` method from the `$` object (which appears to be a custom library).

**Library Used: jQuery**

The test case uses jQuery, which is a popular JavaScript library used for DOM manipulation and event handling. The library provides a convenient way to interact with the Document Object Model (DOM) of web pages.

In the provided benchmark, jQuery is used to select elements by their IDs using the `$()` function. This function takes an ID as an argument and returns the element with that ID or `null` if no such element exists.

**Options Compared**

The three options compared in the benchmark are:

1. **`document.getElementById("child")`**: This method uses the built-in `ElementById()` function to find an element by its ID.
2. **`$("#child")`**: This method uses jQuery's `$()` function to select an element by its ID.
3. **`$parent.find("#child")`**: This method uses the `find()` method from the `$` object (which appears to be a custom library) to find an element by its ID.

**Pros and Cons of Each Approach**

1. **`document.getElementById("child")`**:
	* Pros: Fastest, lightweight, and most compatible with older browsers.
	* Cons: Requires more manual DOM manipulation and may not work as expected in complex layouts.
2. **`$("#child")`**: (jQuery)
	* Pros: Convenient, easy to use, and works well with jQuery's other features like `.css()` and `.html()`.
	* Cons: May have performance issues if not optimized correctly, and requires the presence of the jQuery library.
3. **`$parent.find("#child")`**:
	* Pros: Works well with complex DOM structures and can be optimized for performance using techniques like caching.
	* Cons: Requires the presence of the custom `$` object library, which may add overhead to the application.

**Special JS Feature/Syntax**

None of these options use special JavaScript features or syntax. They are all standard JavaScript methods or functions.

**Other Alternatives**

If you don't have access to jQuery, you could also consider using other libraries like React or Angular for DOM manipulation and event handling. Alternatively, you could implement your own custom library for finding elements by ID using a loop or recursion.

Keep in mind that the performance differences between these approaches may not be significant for most use cases, but they can add up when dealing with large datasets or complex applications.

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/84.0.4147.89 Safari/537.36

Browser/OS: Chrome 84 on Windows

View result in a separate tab

Test name	Executions per second
$("#child")	518295.6 Ops/sec
$parent.find("#child")	293703.2 Ops/sec
document.getElementById("child")	1767809.4 Ops/sec

Related benchmarks:

Test find by id (version: 0)

Compare three approach for find by id

Comparing performance of: $("#child") vs $parent.find("#child") vs document.getElementById("child")

Created: 4 years ago by: Guest

Jump to the latest result

$("#child")

$parent.find("#child")

document.getElementById("child")

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):