Benchmark: getElementById, querySelector, querySelectorAll, and salt.js routine

HTML Preparation code:

<div id="test">Test</div>

Script Preparation code:

window.$ = function(s) {
    return document[{
        '#': 'getElementById',
        '.': 'getElementsByClassName',
        '@': 'getElementsByName',
        '=': 'getElementsByTagName'}[s[0]]
        || 'querySelectorAll'](s.slice(1))
};

Tests:

getElementById
document.getElementById("test");
querySelector
document.querySelector("#test")
querySelectorAll
document.querySelectorAll("#test")
salt.js $ routine
$('#test');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getElementById
querySelector
querySelectorAll
salt.js $ routine

Fastest: N/A

Slowest: N/A

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/87.0.4280.66 Safari/537.36

Browser/OS: Chrome 87 on Windows

View result in a separate tab

Test name	Executions per second
getElementById	1948981.4 Ops/sec
querySelector	1493411.2 Ops/sec
querySelectorAll	677368.0 Ops/sec
salt.js $ routine	1095293.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark, hosted on MeasureThat.net, measures the performance of different approaches to retrieving elements from an HTML document using JavaScript. The benchmark consists of four individual test cases:

1. `getElementById`
2. `querySelector`
3. `querySelectorAll`
4. A custom implementation called "salt.js $ routine"

**Options Compared**

The benchmark compares the following options:

* `document.getElementById` ( traditional method)
* `document.querySelector` ( modern, more flexible method)
* `document.querySelectorAll` ( variant of `querySelector` for multiple elements)
* The custom "salt.js $ routine" which uses a different syntax and approach.

**Pros and Cons of Each Approach**

1. **document.getElementById**: This is the traditional way of retrieving an element by its ID using `document.getElementById`. It's simple, straightforward, but may be slower due to the overhead of traversing the DOM tree.
2. **document.querySelector**: This method allows you to select elements based on a CSS selector syntax. While more flexible, it can be slower than `getElementById` because it needs to parse the selector and traverse the DOM tree.
3. **document.querySelectorAll**: Similar to `querySelector`, but returns multiple elements instead of a single one. It's useful when you need to retrieve multiple elements with the same selector.
4. **salt.js $ routine**: This custom implementation uses a different syntax and approach, which is likely optimized for performance. The exact details are not provided in the benchmark, but it's likely that this method has been tuned for better performance.

**Library Used: Salt.js**

The "salt.js" library is used in the custom implementation of the $ routine. Without more information about the library, we can't provide detailed insights into its functionality and purpose. However, based on the context, it seems to be a performance optimization library designed to improve the speed of DOM queries.

**Special JS Feature/Syntax**

There doesn't appear to be any special JavaScript features or syntax used in this benchmark. The methods used are all standard JavaScript APIs.

**Other Alternatives**

If you're looking for alternative approaches to DOM querying, here are a few options:

* **VanillaJS**: Instead of using the `document.getElementById`, `querySelector`, and `querySelectorAll` methods, you could use vanilla JavaScript functions like `getElementsByClassName`, `getElementsByTagName`, or even using the `Document` object's properties (e.g., `document.body.children[0]`) to retrieve elements.
* **Query Library**: If you need more advanced query capabilities, you might consider using a dedicated query library like jQuery, which provides a robust and flexible way to select elements in your HTML documents.
* **Optimized Libraries**: There are libraries like FastDOM, which aim to provide faster DOM querying than the standard JavaScript APIs.

Keep in mind that each approach has its trade-offs, and the choice of method depends on the specific requirements of your project.

Related benchmarks:

getElementById, querySelector, querySelectorAll, and salt.js routine (version: 0)

Comparing performance of: getElementById vs querySelector vs querySelectorAll vs salt.js $ routine

Created: 4 years ago by: Guest

Jump to the latest result

getElementById

querySelector

querySelectorAll

salt.js $ routine

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):