Benchmark: getElementById vs id toggling class

HTML Preparation code:

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

Tests:

id
test.classList.toggle("monkey");
getElementById
document.getElementById("test").classList.toggle("monkey");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
id
getElementById

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Windows

View result in a separate tab

Test name	Executions per second
id	817201.6 Ops/sec
getElementById	1350591.6 Ops/sec

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's being tested, compared, and the pros and cons of each approach.

**Benchmark Overview**

The benchmark compares two ways to toggle a CSS class on an HTML element using either the `id` attribute or `getElementById()` method.

**What is being compared?**

Two individual test cases are being compared:

1. `test.classList.toggle("monkey");`: This uses the `classList` property of an HTML element directly.
2. `document.getElementById("test").classList.toggle("monkey");`: This uses the `getElementById()` method to retrieve the element and then toggles its CSS class.

**Options Compared**

The two test cases are comparing:

1. **Direct access**: Using the `classList` property of an HTML element (Test Case 1).
2. **DOM query**: Using the `getElementById()` method to retrieve the element and then accessing its CSS class (Test Case 2).

**Pros and Cons of Each Approach**

**Direct Access (`classList` property)**

Pros:

* Faster, as it directly accesses the element's properties without going through the DOM tree.
* Less overhead due to fewer function calls.

Cons:

* May not work correctly if the element is not yet loaded or parsed by the browser.
* May not be compatible with older browsers that don't support `classList`.

**DOM Query (`getElementById()` method)**

Pros:

* More widely supported across browsers, as it's a standard DOM method.
* Works even when the element is not yet loaded or parsed.

Cons:

* Slower due to the additional function call and DOM query operation.
* May have more overhead due to parsing and compiling the CSS selector.

**Library Usage**

In this benchmark, no libraries are explicitly mentioned. However, it's worth noting that some libraries like jQuery might provide a more convenient way to access elements and toggle their classes using `$(selector).toggleClass(className)`. But for this specific benchmark, we're focusing on native JavaScript methods.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. The code only uses standard JavaScript methods and properties.

**Other Alternatives**

If you wanted to add another test case, some alternative approaches could be:

* Using a CSS class selector (e.g., `#test.class-monkey`) instead of the `classList` property.
* Using a different DOM query method, like `document.querySelector()` or `document.querySelectorAll()`.
* Adding more complexity to the test cases, such as using event listeners or animation timing functions.

Keep in mind that adding new test cases can increase the complexity and variability of the benchmark, making it harder to analyze and interpret results.

Related benchmarks:

getElementById vs id toggling class (version: 0)

Comparing performance of: id vs getElementById

Created: 2 years ago by: Guest

Jump to the latest result

id

getElementById

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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