Benchmark: Comparing pure setAttribute vs if/else setAttribute/className

Tests:

With className
for(let i=0; i<1000; i++) { let element = document.createElement('div'); let attributes = { class: 'class1 test--class2', width: '600px', height: '400px' }; for (let attribute in attributes) { if (attributes[attribute] === 'class') { element.className = attribute; } else element.setAttribute(attribute, attributes[attribute]); } }
Without className
for(let i=0; i<1000; i++) { let element = document.createElement('div'); let attributes = { class: 'class1 test--class2', width: '600px', height: '400px' }; for (let attribute in attributes) { element.setAttribute(attribute, attributes[attribute]); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
With className
Without className

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and test cases.

**What is being tested?**

The benchmark tests the performance difference between two approaches:

1. `setAttribute` (without using `className`)
2. An if-else statement that checks for a specific value (`"class"`), and sets `element.className` accordingly, followed by setting other attributes using `setAttribute`.

In summary, the test compares the speed of setting attributes directly using `setAttribute`, versus checking for a specific attribute name ("class") and then setting all other attributes.

**Options being compared:**

* **Without className**: Uses `setAttribute` to set all attributes.
* **With className**: Uses an if-else statement to check if the attribute is "class", and sets `element.className` accordingly, followed by using `setAttribute` for other attributes.

**Pros and Cons of each approach:**

1. **Without className (setAttribute):**
	* Pros:
		+ Simple and straightforward.
		+ No additional logic or checks required.
	* Cons:
		+ May lead to slower performance if the attribute is "class" due to the conditional check.
2. **With className (if-else statement + setAttribute):**
	* Pros:
		+ Can potentially be faster for attributes other than "class", as it avoids a conditional check.
	* Cons:
		+ Requires an additional logical step, which may introduce overhead.
		+ May lead to slower performance if the attribute is frequently checked.

**Library and special JS features:**

None of the provided test cases use any specific libraries or special JavaScript features that would affect the benchmarking outcome. However, it's worth noting that using `className` can be affected by CSS inheritance rules in some browsers, which might impact performance.

**Other considerations:**

* The use of `for...in` loop to iterate over attributes may lead to slower performance due to the way it iterates over object properties.
* The creation and destruction of elements (1000 times) may introduce additional overhead due to garbage collection and DOM manipulations.

**Alternative approaches:**

1. **Using `forEach` loop**: Instead of using a for-in loop, consider using an array-based approach with `forEach` to iterate over attributes. This might provide better performance.
2. **Simplifying the if-else statement**: Consider simplifying or removing the conditional check and directly setting all attributes using `setAttribute`, similar to the "Without className" approach.
3. **Optimizing attribute settings**: Look into optimizing attribute settings by reducing the number of attribute assignments, such as by batching multiple assignments together.

Keep in mind that these alternative approaches may not necessarily provide significant performance improvements, and might even introduce additional complexity or overhead.

Related benchmarks:

Comparing pure setAttribute vs if/else setAttribute/className (version: 0)

Testing whether an if/else statement slows down the speed difference between setAttribute and className

Comparing performance of: With className vs Without className

Created: 6 years ago by: Registered User

Jump to the latest result

With className

Without className

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):