Benchmark: get by id - MeasureThat.net

HTML Preparation code:

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script>
<div id="testElement"></div>

Script Preparation code:

function getElement(a,b,c){var d;return void 0==b&&(d=document.getElementById(a)||document.querySelector(a)),null==d&&(0==b?(d=document.getElementsByClassName(a),0==d.length&&(d=document.getElementsByTagName(a)),0==d.length&&(d=document.querySelectorAll(a)),0==d.length&&(d=getElementsByClassName(a))):(c=null==c?0:c,d=document.getElementsByClassName(a)[c]||document.getElementsByTagName(a)[c]||document.querySelectorAll(a)[c]||getElementsByClassName(a)[c])),d}

Tests:

vanilla
var el = document.getElementById("testElement"); var className = el.className;
jquery
var el = $("#testElement")[0]; var className = el.className;
custom function
var el = getElement("testElement"); var className = el.className;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
vanilla
jquery
custom function

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 break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark definition is a JSON object that specifies the script preparation code, HTML preparation code, and individual test cases. Here's what each part does:

* **Script Preparation Code**: This code defines a function called `getElement` that retrieves an element by its ID or class name from the DOM. The function returns the first matching element found in the specified order (ID, classes, tags, then elements). The purpose of this function is to provide an alternative way to retrieve an element without relying on built-in browser functions.
* **Html Preparation Code**: This code includes a script tag that loads jQuery 3.1.0 from a CDN, and a div element with the id `testElement`.

**Individual Test Cases**

There are three individual test cases:

1. **vanilla**: This test case uses the built-in JavaScript function `document.getElementById` to retrieve an element by its ID, and then extracts the class name of that element.
2. **jquery**: This test case uses jQuery's `$()` function to retrieve the first matching element with the id `testElement`, and then extracts the class name of that element.
3. **custom function**: This test case uses the custom `getElement` function defined in the script preparation code to retrieve an element by its ID, and then extracts the class name of that element.

**Comparison of Approaches**

The three approaches differ in how they retrieve the element:

* **vanilla**: Uses the built-in JavaScript function `document.getElementById`, which is a lightweight way to retrieve an element by its ID.
* **jquery**: Uses jQuery's `$()` function, which provides additional functionality and flexibility for DOM manipulation, but also adds overhead due to the library itself.
* **custom function**: Uses a custom-written function `getElement` that provides an alternative way to retrieve an element, allowing developers to control the exact logic used.

**Pros and Cons**

Here are some pros and cons of each approach:

* **vanilla**: Pros:
	+ Lightweight and fast
	+ No additional dependencies or libraries needed
Cons:
	+ Limited functionality compared to jQuery
* **jquery**: Pros:
	+ Provides additional features and functionality for DOM manipulation
	+ Can be more convenient for developers familiar with the library
Cons:
	+ Adds overhead due to the library itself
	+ Requires an additional dependency (jQuery)
* **custom function**: Pros:
	+ Allows developers to control the exact logic used for element retrieval
	+ No additional dependencies or libraries needed
Cons:
	+ Requires custom implementation and maintenance

**Library: jQuery**

In this benchmark, jQuery is used as a library to provide additional functionality for DOM manipulation. The `$()` function is used to retrieve the first matching element with the id `testElement`.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark. However, it's worth noting that some browsers may have specific quirks or behaviors when using certain functions or libraries.

**Other Alternatives**

If you wanted to write a custom implementation for retrieving an element by its ID, you could use the `getElementsById` function from the `DOMTokenList` interface (introduced in HTML5) or implement your own logic using the `document.getElementsByTagName`, `document.getElementsByClassName`, and `element.querySelector` methods.

Alternatively, you could use other libraries like DOMPurify, a lightweight library for parsing and sanitizing HTML, which provides similar functionality to jQuery's `$()` function.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:48.0) Gecko/20100101 Firefox/48.0

Browser/OS: Firefox 48 on Windows

View result in a separate tab

Test name	Executions per second
vanilla	5935229.0 Ops/sec
jquery	1632894.9 Ops/sec
custom function	5915667.0 Ops/sec

Related benchmarks:

get by id (version: 0)

Comparing performance of: vanilla vs jquery vs custom function

Created: 8 years ago by: Guest

Jump to the latest result

vanilla

jquery

custom function

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):