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 = 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

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what is tested, the pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition provides a custom JavaScript function called `getElement(a, b, c)` that is used to retrieve an element from the DOM. The function takes three parameters: the ID or class name of the element (`a`), the index of the element among its siblings with the same class name (`b`), and the document (`c`) itself.

**Options Compared**

The benchmark compares three different approaches for retrieving an element by its class name:

1. **Vanilla**: The `getElementById()` method, which is a native DOM method that returns the first element with the specified ID.
2. **jQuery**: The `$` function from the jQuery library, which is used to select elements based on their class names or IDs.
3. **Custom Function**: A custom JavaScript function called `getElement(a, b, c)` that uses various methods to retrieve an element by its class name.

**Pros and Cons of Each Approach**

1. **Vanilla**:
	* Pros: Native DOM method, no dependencies on external libraries.
	* Cons: May be slower than other methods, as it needs to traverse the DOM tree.
2. **jQuery**:
	* Pros: Fast and efficient, uses a caching mechanism to improve performance.
	* Cons: Requires an external library (jQuery), may not work in all browsers or environments.
3. **Custom Function**:
	* Pros: Allows for customization and control over the retrieval process, can be optimized for specific use cases.
	* Cons: Requires manual DOM traversal or manipulation, may be slower than native methods.

**Library and Syntax**

The `getElement()` custom function uses various methods to retrieve an element by its class name, including:

* `document.getElementById(a)` (vanilla)
* `$` function from jQuery (`$(a)[0]`)
* `document.getElementsByClassName(a)`, `document.getElementsByTagName(a)`, or `document.querySelectorAll(a)` (custom implementation)

**Special JS Features or Syntax**

There is no special JavaScript feature or syntax used in this benchmark. The custom function uses standard DOM methods, and the jQuery method relies on the `$` function from the jQuery library.

**Other Considerations**

* The benchmark uses a fake HTML element (`<div id="testElement"></div>`) to test the retrieval of an element by its class name.
* The benchmark measures the number of executions per second for each approach, which can be affected by factors such as browser performance, system resources, and network conditions.

**Alternatives**

Other alternatives for retrieving an element by its class name include:

1. `document.querySelector(a)`: A modern DOM method that returns the first matching element based on the specified selector.
2. `document.querySelectorAll(a)`: A DOM method that returns a NodeList of all matching elements based on the specified selector.
3. Using CSS selectors or attribute-based selection methods, such as `element.getAttribute("class")`.

These alternatives may offer different trade-offs in terms of performance, complexity, and compatibility with various browsers and environments.

Related benchmarks:

get by id (version: 0)

Comparing performance of: vanilla vs jquery vs custom function

Created: 9 years ago by: Guest

Jump to the latest result

vanilla

jquery

custom function

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):