Benchmark: Set className vs. setAttribute

HTML Preparation code:

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

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = "bar-" + i; }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", "bar-" + i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
className
setAttribute

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The benchmark compares two approaches to set a CSS class name vs. setting an attribute with the same value. The test is designed to measure the performance difference between these two methods.

**Options Compared**

There are two options being compared:

1. `className` (also known as "dot notation" or "property chaining"): This approach sets the `className` property of an HTML element using the dot notation, e.g., `element.className = 'bar-' + i;`.
2. `setAttribute` (also known as "attribute assignment"): This approach sets an attribute named `class` on an HTML element using the `setAttribute()` method, e.g., `element.setAttribute('class', 'bar-' + i);`.

**Pros and Cons of Each Approach**

1. **className**:
	* Pros:
		+ More intuitive and readable code.
		+ Can be more efficient if the same class is set multiple times (e.g., using a CSS class selector).
	* Cons:
		+ May not work correctly with certain browsers or older versions of HTML.
2. **setAttribute**:
	* Pros:
		+ Works consistently across all browsers and versions.
		+ Does not rely on the `className` property being set first.
	* Cons:
		+ Less intuitive code, which can lead to mistakes or performance issues if used incorrectly.

**Library Usage**

None of the test cases use any external libraries. The benchmark focuses solely on comparing the performance difference between two basic JavaScript methods.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in these benchmarks. The tests are designed to be simple, straightforward, and easily understandable by software engineers.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

1. Using CSS class names: You can use CSS classes instead of setting individual attributes for each element.
2. Using a library like jQuery: If you need to work with DOM elements frequently, using a library like jQuery might be more efficient and convenient.
3. Optimizing the benchmark: Depending on your specific requirements, you might be able to optimize the benchmark further by reducing unnecessary computations or eliminating browser-specific issues.

Keep in mind that these alternatives may not directly compare to the `className` vs. `setAttribute` approach tested on MeasureThat.net.

Related benchmarks:

Set className vs. setAttribute (version: 0)

Comparing performance of: className vs setAttribute

Created: 6 years ago by: Guest

Jump to the latest result

className

setAttribute

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):