Benchmark: Benchmark - MeasureThat.net

HTML Preparation code:

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

Tests:

Test123
var element = document.getElementById("foo"); element.className = "foo"; var i = 1000; while (i--) { element.className += " bar"; }
Test4455
var element = document.getElementById("foo"); element.className = "foo"; var i = 1000; while (i--) { element.classList.add("bar"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Test123
Test4455

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

**Benchmark Overview**

The benchmark measures the performance difference between two approaches:

1. Assigning a CSS class using `className` property (Test123)
2. Adding a CSS class using `classList.add()` method (Test4455)

**Script Preparation Code**

The script preparation code is empty, which means that the benchmarker doesn't need to set up any external dependencies or initialize any libraries.

**HTML Preparation Code**

The HTML preparation code creates an HTML element with an ID of "foo" and assigns a class of "test". This element will be used as a target for both tests.

**Individual Test Cases**

There are two test cases:

1. **Test123**: Assigns the CSS class "foo" using `element.className = "foo";` and then appends a new class "bar" in a loop (`while (i--) { ... }`). This approach uses the `className` property to dynamically set classes on the element.
2. **Test4455**: Adds the CSS class "bar" using `element.classList.add("bar");` in a loop (`while (i--) { ... }`). This approach uses the `classList` API to add and remove classes.

**Comparison**

The benchmark is comparing the performance of these two approaches:

* **Class assignment vs. Class addition**: Both tests aim to append multiple classes on the element.
* **Property-based vs. API-based approach**: Test123 uses the `className` property, while Test4455 uses the `classList.add()` method.

**Pros and Cons**

* **Test123 (className)**:
	+ Pros: Simple and straightforward implementation.
	+ Cons: May not be as efficient due to the overhead of parsing and executing a string.
* **Test4455 (classList.add())**:
	+ Pros: More modern API, which can lead to better performance due to optimized string manipulation.
	+ Cons: Requires knowledge of the `classList` API.

**Other Considerations**

The benchmark doesn't account for other factors that might affect performance, such as:

* Browser version and architecture
* CSS class name length and complexity
* Document loading speed and size

**Library or Framework Used (if applicable)**

There are no apparent libraries or frameworks used in the benchmark. The tests only use standard JavaScript features.

No special JS feature or syntax is used beyond the `classList` API, which is a modern addition to the ECMAScript specification.

**Alternatives**

If you wanted to create similar benchmarks, you could explore other approaches for adding CSS classes, such as:

* Using `style` attribute and setting multiple values with spaces separated (e.g., `"class": "foo bar baz"`).
* Creating an array of class names and iterating over it.
* Utilizing other libraries or frameworks that provide optimized string manipulation, such as `lodash` or `underscore`.

Keep in mind that the performance differences between these approaches may vary depending on the specific use case and browser implementations.

Related benchmarks:

Benchmark (version: 0)

Comparing performance of: Test123 vs Test4455

Created: 7 years ago by: Guest

Jump to the latest result

Test123

Test4455

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):